SC1029 – ShellCheck Wiki

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In [..](..) you shouldn't escape ( or ).

Problematic code:

[[ -e ~/.bashrc -a \( -x /bin/dash -o -x /bin/ash \) ]]

Correct code:

[[ -e ~/.bashrc -a ( -x /bin/dash -o -x /bin/ash ) ]]

Rationale:

You don't have to -- and can't -- escape ( or ) inside a [[ .. ]] expression like you do in [ .. ]. Just remove the escaping.

Exceptions:

None.

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