Путеводитель по Руководству Linux
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   dash    ( 1 )

интерпретатор команд (оболочка) (command interpreter (shell))
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Ошибки (баги) (Bugs)

Setuid shell scripts should be avoided at all costs, as they are a
     significant security risk.


     PS1, PS2, and PS4 should be subject to parameter expansion before
     being displayed.