SC1035

You need a space here

Problematic code:

if ![-z foo ]; then true; fi # if the command `[-z' with args `foo', `]' is not successful..

Correct code:

if ! [ -z foo ]; then true; fi # if the command `[' with args `-z'. `foo', `]' is not sucessful..

Rationale:

Bourne shells are very whitespace sensitive. Adding or removing spaces can drastically alter the meaning of a script. In these cases, ShellCheck has noticed that you're missing a space at the position indicated.

Exceptions

None.