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Date: Thu, 21 Apr 2011 16:36:35 +0400
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Subject: [Comm] usermod -a -G
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в убунте 
$ usermod --help
Использование: usermod [параметры] имя пользователя

Параметры:
.....
  -a, --append
добавить пользователя в дополнительные
ГРУППЫ, указанные в параметре -G не удаляя
пользователя из других групп
.......

а у нас такого нет. хотелось бы "не удаляя"