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How can I do by command line in terminal that an administrator should become standard (normal)?

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Kulfy
  • 17,696

1 Answers1

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You should change the group of that user with following command:

deluser --group [options] group

Man page says:

Remove a user from a specific group

If called with two non-option arguments, deluser will remove a user from a specific group.

Mahdi
  • 1,467