Users & Permissions

Users and groups 

 List all groups and users in groups 

 getent group 

 

 Add a user to a group  

 sudo adduser username groupname 

 which is the same as  

 sudo usermod -aG groupname username 

 

 Create a new user  

 sudo useradd -options_here username 

 Options available : 

 

 m = create home directory 

 

 

 Permissions 

 To see if a particular user can run a command  

 sudo -u USER COMMAND 

   

 To change a folders permission  

 sudo chmod -R u+rwx,g+rwx,o-rwx /path/to_folder 

 or change ownership 

 sudo chown -R NEW_USER:NEW_GROUP FOLDER_NAME 

 -R = recursive 

   Note : user or group can be left blank 

 

 Passwords 

 To change the curretly logged in user's password  passwd   

 To change a different users password sudo passwd USERNAME