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The manual of GNU tar only states that --restrict:

   --restrict
          disable use of some potentially harmful options

Can anyone elaborate on what are these "harmful" options? I could not find it in the documentation.

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up vote 4 down vote accepted

The only option --restrict currently disable is the ability to spawn a subshell with the ! command when you are prompted to replace a tape in a multi-volume archive.

2005/12/06 New function. Disable '!' command if given --restrict option.

Reference: http://git.savannah.gnu.org/gitweb/?p=tar.git;a=commit;h=ffc4fb7bdd03d095c46233770eb1a40fcaa3999c

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