User Management

Password

sudo passwd <username>

you may want to remove your keyring lock file as it doesn’t always update:

rm ~/.local/share/keyrings/login.keyring

Users, groups

From:

Create a new group
```
sudo addgroup groupname
```
Create a new user
```
sudo adduser username
```
create a new group by gid
```
groupadd -g <group-id> <groupname>
```

create a new user and group by groupid

MYUSER=ubuntu
MYGID=1000
MYUID=1000

groupadd -g ${MYGID} ${MYUSER}
useradd -u ${MYUID} -g ${MYGID} -p $(perl -e 'print crypt($ARGV[0], "password")' 'password') -G adm,sudo ${MYUSER} && mkdir /home/${MYUSER} && chown ${MYUSER}:${MYUSER} /home/${MYUSER}

another variant:

useradd -m my_new_username -p $(openssl passwd my_custom_password) && usermod -s /bin/bash my_new_username &&  usermod -aG sudo,other_groups,another_group my_new_username

Find groups associated with current user:
```
groups $USER
```

Add new user to new groups

sudo usermod -aG adm username
sudo usermod -aG sudo username
#...

modify list of groups user belongs to
unlike the last command(-aG), -G redefines rather than appends
```
sudo usermod -G usergroup,othergroup username
```

Change password

passwd [username]

Remove User

remove user from group
```
sudo deluser username groupname
```
remove user completely
```
sudo deluser --remove-home username
```
more tips here

delete group

groupdel <groupname>

Force new password

passwd --expire <username_here>

Expire / unexpire

from here

Expire Account

Let the account expire to disallowing a user from logging in from any source including ssh:

# disallow peter from logging in
sudo usermod --expiredate 1 peter

This is how you can reenable that account:

# set expiration date of peter to Never
sudo usermod --expiredate "" peter

List all users / groups

users:

cut -d: -f1 /etc/passwd
getent passwd

groups:

cut -d: -f1 /etc/group
getent group

find out who is logged on

users
who
whoami

list login dates / times, users, etc

last