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+## "You need `\` before line feeds to break lines in `[ ]`.
+
+### Problematic code:
+
+```sh
+[ "$filename" =
+  "$otherfile" ]
+```
+
+### Correct code:
+
+```sh
+[ "$filename" = \
+  "$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!
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