TLDR
Enter a command. For example: libreoffice, perl rename, ubuntu bug.

usermod

 
Modifies a user account. See also: users, useradd, userdel. More information: https://manned.org/usermod.
 
  • Change a username:
     
    sudo usermod --login {{new_username}} {{username}}
     
  • Change a user id:
     
    sudo usermod --uid {{id}} {{username}}
     
  • Change a user shell:
     
    sudo usermod --shell {{path/to/shell}} {{username}}
     
  • Add a user to supplementary groups (mind the lack of whitespace):
     
    sudo usermod --append --groups {{group1,group2,...}} {{username}}
     
  • Change a user home directory:
     
    sudo usermod --move-home --home {{path/to/new_home}} {{username}}

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