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org.sonar.l10n.shellcheck.rules.shellcheck.SC2216.html Maven / Gradle / Ivy

Piping to 'rm', a command that doesn't read stdin. Wrong command or missing xargs?
Problematic code
ls | echo                      # Want to print result
cat files | rm                 # Want to delete items from a file
find . -type f | cp dir        # Want to process 'find' output
rm file | true                 # Want to ignore errors

Correct code
ls
cat files | while IFS= read -r file; do rm -- "$file"; done
find . -type f -exec cp {} dir \;
rm file || true

Rationale
You are piping to one of several commands that don't read from stdin.
This may happen when:

Confusing one command for another, e.g. using echo where cat was intended.
Incorrectly refactoring, leaving a | on the previous line.
Missing xargs, because stdin should be passed as positional parameters instead (use xargs -0 if at all possible).
Intending to use || instead of |

Check your logic, and rewrite the command so data is passed correctly.
Exceptions
If you've overridden a command to return output, you can either rename it to make this obvious, or [[ignore]] this message.