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+# Don't put spaces around the = in assignments.
+
+### Problematic code:
+
+    foo = 42
+
+### Correct code:
+
+    foo=42
+
+### Rationale:
+
+Shells are space sensitive. `foo=42` means to assign `42` to the variable `foo`. `foo = 42` means to run a command named `foo`, and pass `=` as `$1` and `42` as `$2`.
+
+### Contraindications
+
+If you actually wanted to run a command named foo and provide `=` as the first argument, simply quote it to make ShellCheck be quiet: `foo "=" 42`.
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