Add User
adduser silosix
Adds user with usermod
sudo usermod -aG usergroup username sudo usermod -aG docker devuser
User & Group Admin Commands
source: https://www.poftut.com/list-users-groups-linux/
Print Users, Home Dir, Shell
cat /etc/passwd
Names only
cat /etc/passwd | grep -v nologin
Print Users that have accessed system
cat /etc/passwd | grep -v nologin
Print Users with Home Dirs
cat /etc/passwd | grep "/home/" | awk -F':' '{ print
Print Groups
cat /etc/group
Print Group Names
cat /etc/group | cut -d : -f 1
adduser Help
mdp@pi:/ $ adduser --help adduser [--home DIR] [--shell SHELL] [--no-create-home] [--uid ID] [--firstuid ID] [--lastuid ID] [--gecos GECOS] [--ingroup GROUP | --gid ID] [--disabled-password] [--disabled-login] [--add_extra_groups] USER Add a normal user adduser --system [--home DIR] [--shell SHELL] [--no-create-home] [--uid ID] [--gecos GECOS] [--group | --ingroup GROUP | --gid ID] [--disabled-password] [--disabled-login] [--add_extra_groups] USER Add a system user adduser --group [--gid ID] GROUP addgroup [--gid ID] GROUP Add a user group addgroup --system [--gid ID] GROUP Add a system group adduser USER GROUP Add an existing user to an existing group general options: --quiet | -q don't give process information to stdout --force-badname allow usernames which do not match the NAME_REGEX configuration variable --help | -h usage message --version | -v version number and copyrigh
usermod Help
mdp@pi:/ $ usermod --help Usage: usermod [options] LOGIN Options: -c, --comment COMMENT new value of the GECOS field -d, --home HOME_DIR new home directory for the user account -e, --expiredate EXPIRE_DATE set account expiration date to EXPIRE_DATE -f, --inactive INACTIVE set password inactive after expiration to INACTIVE -g, --gid GROUP force use GROUP as new primary group -G, --groups GROUPS new list of supplementary GROUPS -a, --append append the user to the supplemental GROUPS mentioned by the -G option without removing him/her from other groups -h, --help display this help message and exit -l, --login NEW_LOGIN new value of the login name -L, --lock lock the user account -m, --move-home move contents of the home directory to the new location (use only with -d) -o, --non-unique allow using duplicate (non-unique) UID -p, --password PASSWORD use encrypted password for the new password -R, --root CHROOT_DIR directory to chroot into -s, --shell SHELL new login shell for the user account -u, --uid UID new UID for the user account -U, --unlock unlock the user account -v, --add-subuids FIRST-LAST add range of subordinate uids -V, --del-subuids FIRST-LAST remove range of subordinate uids -w, --add-subgids FIRST-LAST add range of subordinate gids -W, --del-subgids FIRST-LAST remove range of subordinate gids -Z, --selinux-user SEUSER new SELinux user mapping for the user accoun
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