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and Linux user management command line needed Ubuntu packages

User management under the latest version of Ubuntu is not working properly (10.04 LTS), including regarding the management of the uid. Here are a few commands to get by in a terminal.

• Show uid and gid of a user:
  > userid
• Add Group:
  > groupadd group_name-gGID
  
• Add User:
  > useradd-uuid-gGID -s/bin/bash -d/home/utilisateur Pxxx-m-user
  
• Change the uid of a user:
  > usermod-u UID user
• Change the gid of a user:
  > usermod-g GID user