Format

• written questions
• practical scripting task
• review of a flawed script
• short operations and security assessment

Notes

Work without production data. Document assumptions. If a tool such as ShellCheck is missing locally, record that and run at least bash -n plus smoke tests.

Questions

Question 01

Explain how you explain interpreter and execution model in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 02

Explain how you verify shebang and file permissions in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 03

Explain how you process parameters safely in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 04

Explain how you apply quoting and expansion rules in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 05

Explain how you evaluate exit codes and error paths in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 06

Explain how you control pipelines and redirections in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 07

Explain how you process text with grep, sed and awk in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 08

Explain how you design safe filesystem operations in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 09

Explain how you structure functions and libraries in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 10

Explain how you parse options with getopts in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 11

Explain how you secure temporary files with mktemp in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 12

Explain how you implement cleanup with trap in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 13

Explain how you add logging and debugging in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 14

Explain how you make scripts idempotent in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 15

Explain how you use ShellCheck and shfmt in reviews in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 16

Explain how you model tests with smoke scripts or Bats in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 17

Explain how you protect secrets and environment variables in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 18

Explain how you guard destructive operations in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 19

Explain how you assess portability between Bash and POSIX sh in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 20

Explain how you define CI/CD gates for scripts in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 21

Explain how you run incident response for broken scripts in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 22

Explain how you explain interpreter and execution model in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 23

Explain how you verify shebang and file permissions in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 24

Explain how you process parameters safely in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 25

Explain how you apply quoting and expansion rules in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 26

Explain how you evaluate exit codes and error paths in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 27

Explain how you control pipelines and redirections in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 28

Explain how you process text with grep, sed and awk in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 29

Explain how you design safe filesystem operations in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 30

Explain how you structure functions and libraries in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 31

Explain how you parse options with getopts in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 32

Explain how you secure temporary files with mktemp in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 33

Explain how you implement cleanup with trap in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 34

Explain how you add logging and debugging in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 35

Explain how you make scripts idempotent in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 36

Explain how you use ShellCheck and shfmt in reviews in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 37

Explain how you model tests with smoke scripts or Bats in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 38

Explain how you protect secrets and environment variables in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 39

Explain how you guard destructive operations in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 40

Explain how you assess portability between Bash and POSIX sh in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 41

Explain how you define CI/CD gates for scripts in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 42

Explain how you run incident response for broken scripts in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 43

Explain how you explain interpreter and execution model in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 44

Explain how you verify shebang and file permissions in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 45

Explain how you process parameters safely in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 46

Explain how you apply quoting and expansion rules in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 47

Explain how you evaluate exit codes and error paths in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Question 48

Explain how you control pipelines and redirections in a Bash script. Name at least one command, one error case, one exit code and one security risk.

Practical Task

Write a script with --help, --dry-run, input validation, logging to stderr and a machine-readable result file. Submit syntax check, test run and review note.

Review Checklist for Professional

• 01. name the shebang and target shell explicitly: Record the affected file, command, exit code and risk.
• 02. quote variable expansions unless word splitting is deliberate: Record the affected file, command, exit code and risk.
• 03. validate inputs before they influence filenames, options or commands: Record the affected file, command, exit code and risk.
• 04. evaluate and document exit codes explicitly: Record the affected file, command, exit code and risk.
• 05. separate stderr and stdout: Record the affected file, command, exit code and risk.
• 06. create temporary files with mktemp: Record the affected file, command, exit code and risk.
• 07. test cleanup through trap: Record the affected file, command, exit code and risk.
• 08. guard destructive operations with dry-run, scope checks and confirmation: Record the affected file, command, exit code and risk.
• 09. never print or commit secrets: Record the affected file, command, exit code and risk.
• 10. check PATH and external dependencies: Record the affected file, command, exit code and risk.
• 11. handle ShellCheck warnings or suppress them with a reason: Record the affected file, command, exit code and risk.
• 12. document portability assumptions between Bash and POSIX sh: Record the affected file, command, exit code and risk.
• 13. name the shebang and target shell explicitly: Record the affected file, command, exit code and risk.
• 14. quote variable expansions unless word splitting is deliberate: Record the affected file, command, exit code and risk.
• 15. validate inputs before they influence filenames, options or commands: Record the affected file, command, exit code and risk.
• 16. evaluate and document exit codes explicitly: Record the affected file, command, exit code and risk.
• 17. separate stderr and stdout: Record the affected file, command, exit code and risk.
• 18. create temporary files with mktemp: Record the affected file, command, exit code and risk.
• 19. test cleanup through trap: Record the affected file, command, exit code and risk.
• 20. guard destructive operations with dry-run, scope checks and confirmation: Record the affected file, command, exit code and risk.
• 21. never print or commit secrets: Record the affected file, command, exit code and risk.
• 22. check PATH and external dependencies: Record the affected file, command, exit code and risk.
• 23. handle ShellCheck warnings or suppress them with a reason: Record the affected file, command, exit code and risk.
• 24. document portability assumptions between Bash and POSIX sh: Record the affected file, command, exit code and risk.
• 25. name the shebang and target shell explicitly: Record the affected file, command, exit code and risk.
• 26. quote variable expansions unless word splitting is deliberate: Record the affected file, command, exit code and risk.
• 27. validate inputs before they influence filenames, options or commands: Record the affected file, command, exit code and risk.
• 28. evaluate and document exit codes explicitly: Record the affected file, command, exit code and risk.
• 29. separate stderr and stdout: Record the affected file, command, exit code and risk.
• 30. create temporary files with mktemp: Record the affected file, command, exit code and risk.
• 31. test cleanup through trap: Record the affected file, command, exit code and risk.
• 32. guard destructive operations with dry-run, scope checks and confirmation: Record the affected file, command, exit code and risk.
• 33. never print or commit secrets: Record the affected file, command, exit code and risk.
• 34. check PATH and external dependencies: Record the affected file, command, exit code and risk.
• 35. handle ShellCheck warnings or suppress them with a reason: Record the affected file, command, exit code and risk.
• 36. document portability assumptions between Bash and POSIX sh: Record the affected file, command, exit code and risk.
• 37. name the shebang and target shell explicitly: Record the affected file, command, exit code and risk.
• 38. quote variable expansions unless word splitting is deliberate: Record the affected file, command, exit code and risk.
• 39. validate inputs before they influence filenames, options or commands: Record the affected file, command, exit code and risk.
• 40. evaluate and document exit codes explicitly: Record the affected file, command, exit code and risk.
• 41. separate stderr and stdout: Record the affected file, command, exit code and risk.
• 42. create temporary files with mktemp: Record the affected file, command, exit code and risk.
• 43. test cleanup through trap: Record the affected file, command, exit code and risk.
• 44. guard destructive operations with dry-run, scope checks and confirmation: Record the affected file, command, exit code and risk.
• 45. never print or commit secrets: Record the affected file, command, exit code and risk.

Practice Appendix: Professional

This appendix is a working backlog for longer trainings, reviews and repetitions. Each task can be checked locally with Bash, test data and a Git repository.

A001. Bash

• Task: validate input and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A002. Review

• Task: explain exit code and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A003. Testing

• Task: check quoting and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A004. Security

• Task: test error path and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A005. Bash

• Task: review log output and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A006. Review

• Task: trace cleanup and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A007. Testing

• Task: scope portability and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A008. Security

• Task: mark security risk and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A009. Bash

• Task: document recovery path and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A010. Review

• Task: write review rule and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A011. Testing

• Task: validate input and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A012. Security

• Task: explain exit code and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A013. Bash

• Task: check quoting and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A014. Review

• Task: test error path and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A015. Testing

• Task: review log output and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A016. Security

• Task: trace cleanup and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A017. Bash

• Task: scope portability and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A018. Review

• Task: mark security risk and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A019. Testing

• Task: document recovery path and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A020. Security

• Task: write review rule and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A021. Bash

• Task: validate input and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A022. Review

• Task: explain exit code and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A023. Testing

• Task: check quoting and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A024. Security

• Task: test error path and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A025. Bash

• Task: review log output and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A026. Review

• Task: trace cleanup and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A027. Testing

• Task: scope portability and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A028. Security

• Task: mark security risk and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A029. Bash

• Task: document recovery path and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A030. Review

• Task: write review rule and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A031. Testing

• Task: validate input and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A032. Security

• Task: explain exit code and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A033. Bash

• Task: check quoting and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A034. Review

• Task: test error path and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A035. Testing

• Task: review log output and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A036. Security

• Task: trace cleanup and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A037. Bash

• Task: scope portability and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A038. Review

• Task: mark security risk and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A039. Testing

• Task: document recovery path and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A040. Security

• Task: write review rule and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A041. Bash

• Task: validate input and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A042. Review

• Task: explain exit code and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A043. Testing

• Task: check quoting and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A044. Security

• Task: test error path and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A045. Bash

• Task: review log output and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A046. Review

• Task: trace cleanup and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A047. Testing

• Task: scope portability and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A048. Security

• Task: mark security risk and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A049. Bash

• Task: document recovery path and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A050. Review

• Task: write review rule and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A051. Testing

• Task: validate input and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A052. Security

• Task: explain exit code and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A053. Bash

• Task: check quoting and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A054. Review

• Task: test error path and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A055. Testing

• Task: review log output and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A056. Security

• Task: trace cleanup and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A057. Bash

• Task: scope portability and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A058. Review

• Task: mark security risk and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A059. Testing

• Task: document recovery path and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A060. Security

• Task: write review rule and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A061. Bash

• Task: validate input and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A062. Review

• Task: explain exit code and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A063. Testing

• Task: check quoting and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A064. Security

• Task: test error path and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A065. Bash

• Task: review log output and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A066. Review

• Task: trace cleanup and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A067. Testing

• Task: scope portability and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A068. Security

• Task: mark security risk and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A069. Bash

• Task: document recovery path and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A070. Review

• Task: write review rule and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A071. Testing

• Task: validate input and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A072. Security

• Task: explain exit code and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A073. Bash

• Task: check quoting and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A074. Review

• Task: test error path and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A075. Testing

• Task: review log output and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A076. Security

• Task: trace cleanup and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A077. Bash

• Task: scope portability and connect the observation explicitly to Bash.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A078. Review

• Task: mark security risk and connect the observation explicitly to Review.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A079. Testing

• Task: document recovery path and connect the observation explicitly to Testing.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.

A080. Security

• Task: write review rule and connect the observation explicitly to Security.
• Evidence: Record the checked command, expected output, actual output and exit code.
• Operations question: What happens with empty input, missing files, missing tools and repeated execution?
• Security question: Can input become an option, path, glob, subshell, eval expression or secret leak?
• Recovery: Describe revert, cleanup, restore, secret rotation or manual correction.