User Management Linux

Some basic user and group management commands

List System Users

$ getent passwd | awk -F: '{ print $1}'

root
daemon
bin
sys
sync
games
man
lp
mail
news
uucp
proxy
www-data
backup
list
irc
gnats
nobody
systemd-network
systemd-resolve
systemd-timesync
messagebus
syslog
_apt
tss
uuidd
tcpdump
sshd
landscape
pollinate
martin
dnsmasq
nginx
bind
ntp

List groups

List the groups the current user is a member of

$ groups
adm sudo audio dip video plugdev netdev 

Add user to group ‘docker’

$ sudo usermod -aG docker martin
# Appends user martin to group docker

sudo usermod -aG sudo newbie
# Adds user newbie to group sudo which makes it possible for the user to run commands as root aka 'sudo' aka 
'Superuser Do'.