Utilities
adduser, addgroup – add a user or group to the system
--gecos GECOS | Set the gecos field for the new entry generated. adduser will not ask for finger information if this option is given. |
--system | Create a system user or group. |
--shell SHELL | Use SHELL as the user’s login shell, rather than the default specified by the configuration file. |
--no-create-home | Do not create the home directory, even if it doesn’t exist. |
--quiet | Suppress informational messages, only show warnings and errors. |
adduser --system --no-create-home proxmoxbackup
adduser --no-create-home --shell /usr/sbin/nologin proxmoxbackup
adduser --disabled-password --gecos "" username
deluser, delgroup – remove a user or group from the system
--system | Only delete if user/group is a system user/group. |
--remove-home | Remove the home directory of the user and its mailspool. |
--remove-all-files | Remove all files from the system owned by this user. |
deluser --system --remove-home proxmoxbackup
usermod – modify a user account
-a, --append | Add the user to the supplementary group(s). Use only with the -G option. |
-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. |
Add current user to the nut group (works after logoff):
usermod -aG nut `whoami`
Random
useradd,adduser
