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You could put a shell script around cd that checks the current working directory every time you cd and alerts you appropriately. A little clunky, I'll admit. I

• 1amzave 16y ago
  From man bash, the variable PROMPT_COMMAND: If set, the value is executed as a command prior to issuing each primary prompt. e.g.: PROMPT_COMMAND='[[ "$PWD" =~ ^/sensitive/area ]] && PS1="be careful: " || PS1="normalprompt: "'