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+## Unexpected parameters after condition. Missing &&/||, or bad expression?
+
+### Problematic code:
+
+```sh
+[ "$1" ] input="$1"
+```
+
+### Correct code:
+
+```sh
+[ "$1" ] && input="$1"
+```
+### Rationale:
+
+ShellCheck found characters (other than redirections) after the `]` or `]]` in a test expression. This is not valid.
+
+This sometimes happens when there was an additional expression or command, but joining `||` or `&&` is missing. Alternatively, it could happen due to typos (like `[[ $1 ]]]` with an extra `]`), or generally from malformed test expressions.
+
+### Exceptions:
+
+None
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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