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+##  To assign the output of a command, use var=$(cmd) .
+
+### Problematic code:
+
+```sh
+var=grep -c pattern file
+```
+
+### Correct code:
+
+```sh
+var=$(grep -c pattern file)
+```
+### Rationale:
+
+To assign the output of a command to a variable, use `$(command substitution)`. Just typing a command after the `=` sign does not work.
+
+### Exceptions:
+
+None.
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