Linux
User management
Commands
| Command | Description |
|---|---|
w | Shows all logged users and what they are doing |
getent passwd | List users with details |
logins -l [user] | Get user details |
| Command | Description |
|---|---|
passwd --status [user] | Check user lock status |
chage -l root [user] | Check user expire status |
chage -E0 [user] | Lock user by expiring account |
usermod -s /sbin/nologin [user] | Lock user shell |
| Command | Description |
|---|---|
id [user | Check user id |
useradd [user] | Adding user |
useradd -m [user] | Adding user with home directory |
passwd [user] | Change user password |
userdel [user] | Delete user |
userdel -r [user] | Delete user and home directory |
Other
Time management
| Command | Description |
|---|---|
timedatectl | Get time configuration |
timedatectl list-timezones | List all timezone (Europe/Paris for  ) |
timedatectl set-timezone [timezone] | Set timezone |
Importants files
| Files | Description |
|---|---|
/etc/shadow | Textual database for admins users |
/etc/passwd | Textual database for normal users |