Interview › Scripting (Bash, Groovy)
What is shellcheck, and what kinds of issues does it catch? [Intermediate]
Answer
ShellCheck is a static analysis tool for shell scripts. It catches quoting bugs, unsafe word splitting, unassigned variables, unreachable code, portability issues, bad test syntax, and many common shell pitfalls.
Technical explanation
It is especially useful because shell scripts often pass simple tests but fail with spaces, empty values, or unusual filenames.
I run it locally, in pre-commit hooks, and as a CI quality gate for automation repositories.
Warnings should be fixed or explicitly disabled with a narrow comment explaining why the code is intentional.
Hands-on example
# Local check
shellcheck scripts/*.sh
# Example CI step
find scripts -name '*.sh' -print0 | xargs -0 shellcheck -x
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