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+# Use $((..)) instead of deprecated $[..]
+
+### Problematic code
+
+```sh
+n=1
+n=$[n+1]
+```
+
+### Correct code
+
+```sh
+n=1
+n=$((n+1))
+```
+
+### Rationale
+
+The `$[..]` syntax was deprecated in Bash 2.0 and replaced with the standard `$((..))` syntax from Korn shell
+
+### Exceptions
+
+None.
+
+### See also
+
+- http://unix.stackexchange.com/questions/209833/what-does-a-dollar-sign-followed-by-a-square-bracket-mean-in-bash
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