User Account Management

Important commands

  1. useradd

  2. groupadd

  3. userdel

  4. groupdel

  5. usermod

Important Files 1. /etc/passwd

  1. /etc/group

  2. /etc/shadow

Examples 

useradd spiderman

The above command creates a user spiderman and by default a group called spiderman as well. The newly created user is a part of its own group. We can create a new group as well in the similar manner, 

groupadd avengers

Now we can add spiderman to the avengers group as well using the command usermod 

usermod -G avengers spiderman

Tip

The above command will add the user to avengers group but it will still be part of its own group spiderman. To change that, use chgrp -R avengers spiderman

The command userdel and groupdel is used to delete the group. We can check for the information about the users using the command, 

cat /etc/passwd

The complete command to create a user. 

useradd -g avengers -s /bin/bash -c "avengers character" -m -d /home/spiderman spiderman

Finally once the user is created, we need to create a password for the user. We can do that by following command. 

sudo passwd spiderman