- # Suggest explicitly using -n in `[ $var ]`
- enable=avoid-nullary-conditions
- # Suggest 'command -v' instead of 'which'
- enable=deprecate-which
- # Suggest quoting variables without metacharacters
- enable=quote-safe-variables
- # Require [[ and warn about [ in Bash/Ksh
- enable=require-double-brackets
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