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You need \ before line feeds to break lines in [ ].

Problematic code:

[ "$filename" =
  "$otherfile" ]

Correct code:

[ "$filename" = \
  "$otherfile" ]

Rationale:

Bash/ksh [[ ]]] can include line breaks anywhere, but [ ] requires that you escape them. If you are writing a multi-line [ .. ] statement, make sure to include these escapes. If the [ ] is supposed to be on a single line, make sure the ] is there.

Exceptions:

None

Related resources:

• Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!

ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.