SC2091

Remove surrounding $() to avoid executing output.

Problematic code:

if $(which "false"); then echo "true"; fi

Correct code:

if which "false" >/dev/null >2&1; then echo "true"; fi

Rationale:

If the $() subshell produces an output it will be evaluated by the if statement, this could result in the execution of the output, which will result in different behaviour than intended.

Exceptions:

None.