users-and-groups

tags: os operating-system computer linux unix is_child_of: operating-systems

Users

Adding users

We can add users using command useradd

useradd nitin

We have to create a directory of this user and user permissions to that directory.

mkdir /home/nitin
 
chown nitin /home/nitin

Now if we see the permissions we will see,

root@515d32d1d259:/home/hemant# ls -alrt /home
total 12
drwxr-xr-x 1 nitin root 4096 Apr  6 11:27 nitin
drwxr-xr-x 1 root  root 4096 Apr  6 11:27 ..
drwxr-xr-x 1 root  root 4096 Apr  6 11:39 .

There is one more way to create a user.

adduser nitin

This does everything for you.

Deleting user

userdel nitin
rm -rf /home/nitin

or

deluser nitin

Switching user

su nitin

su is switch user command.

Changing the password

passwd nitin
 
New Password:
Retype New Password:

Groups

A group is a collection of users with a set of permissions.

Creating a group

groupadd bitphile

Adding group to directory and file

chgrp nitin /home/nitin

Adding user to the group

usermod -aG bitphile nitin

-aG means add group.

Delete user from the group

gpasswd -d bitphile nitin

Delete group

groupdel bitphile

See also

1. sudoers file