# Users, Permissions and Groups

• Users
• Groups
• Permissions

# Users

Command	Action
adduser	Create a new user
cat /etc/passwd	View all users on the system
cat /etc/passwd | grep {name}	search for user
chsh -s /path/to/shell	Change default shell for a user
id	View user details
passwd	Change your own password
passwd	Change user password
su -	Switch to another user
userdel -r	Delete a user and their home directory
usermod -aG sudo	Add user to sudo group
usermod -l <new_username> <old_username>	Change username
visudo (Add: ALL=(ALL:ALL) ALL)	Grant sudo privileges to a user
whoami	View current username

# Groups

Command	Action
grep '^sudo:' /etc/group	Display members of the sudo group
groups	View groups a user belongs to

# Permissions

Command	Action
chgrp new_group file	Change group
chmod ### file	Change permissions
chown -R new_owner:new_group dir	Change owner and group
chown new_owner dir	Change owner

groups forge

If forge is listed in the sudo group, then it has sudo privileges. The output might look something like this:

forge : forge sudo www-data