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lang-bash
[ .. ], you need quotes around the variable expansion to avoid issues with white space, and also=is the standard equality comparison. While==works in Bash and ksh, it doesn't in e.g. Dash, and it causes problems in zsh, and there's little reason for using it. Also, your code would be clearer if you indented it properly. And then there's the thing that I'm not sure if this answer gives anything on top of the previous ones.