User & Group Management in Linux

User and Group Management

·        See the /etc/passwd and /etc/shadow files

These files contain the information about the user login and password and other variables.

·        Make a new user “tux” with default home directory and password “pakistan”

sudo useradd -p pakistan tux

·        See the changes in /etc/passwd and /etc/shadow

Both of the files contain last row as tux user.

tux:x:1001:1002::/home/tux:/bin/sh

tux:pakistan:15249:0:99999:7:::

·        Create a group “BIT10” with group ID 99 and change tux’s group to “BIT10"

sudo groupadd -gid 99 BIT10A

sudo gpasswd -a tux BIT10A;    sudo usermod -g BIT10A tux

·        Move the user’s current home directory to the new directory “/studentHome”

sudo usermod -d /sohaibHome tux

·        Change this user’s password to “d!g!t@l” with following settings:-

Lock the account if it has been inactive for 5 days

Minimum 2 days must be past before the user can change hi/her/its password

sudo usermod -p 'd!g!@|' –f 5 tux;

chage –i 5 –m 2 tux;

·        See the changes in /etc/passwd and /etc/shadow and /etc/group files

Both show changes for tux

·        Delete the group “BIT10” and delete the account of “tux”

groupdel BIT10A