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+##  Use && for logical AND. Single & will background and return true.
+
+### Problematic code:
+
+```sh
+if [ "$1" = "--verbose" ] | [ "$1" = "-v" ]
+then
+  verbose=1
+fi
+```
+
+### Correct code:
+
+```sh
+if [ "$1" = "--verbose" ] || [ "$1" = "-v" ]
+then
+  verbose=1
+fi
+```
+### Rationale:
+
+ShellCheck found a `test` command followed by a `|`. This was undoubtedly intended as a logical OR (`||`).
+
+### Exceptions:
+
+None
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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