3 SC2159

Joachim Ansorg edited this page 2021-11-12 19:41:22 +01:00

Table of Contents

• [ 0 ] is true. Use false instead.
• Problematic code:
• Correct code:
• Rationale:
• Exceptions:

[ 0 ] is true. Use false instead.

Problematic code:

if [ 0 ]
then
  echo "always triggers"
fi

Correct code:

if false
then
  echo "never triggers"
fi

Rationale:

[ str ] checks whether str is non-empty. It doesn't matter if str is 0, it will still be evaluated for non-emptyness.

Instead, use the command false which -- as the manual puts it -- does nothing, unsuccessfully.

Exceptions:

None

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