usermod command

Definition:

• modify a user account

Synopsis:

• usermod [options] LOGIN

List of options:

• -a, --append
  • Add the user to the supplementary group(s). Use only with the -G option.
• …
• • -c, --comment
• …
• -e, --expiredate
  • format YYYY-MM-DD
• …
• -G, --groups GROUP1[,GROUP2,...[,GROUPN]]]
  • A list of supplementary groups which the user is also a member of.
    • Each group is separated from the next by a comma, with no intervening whitespace.
    • The groups are subject to the same restrictions as the group given with the -g option.
  • without -a, user will be removed from all other groups and added to the new ones
• …
• -s, --shell SHELL