User Management in Linux

How to know the user details

chirag@chirag-MacBookAir:~$ getent passwd username

How to know the id of user

chirag@chirag-MacBookAir:~$ id username

How to change the UID

chirag@chirag-MacBookAir:~$ usermod -u 2000 username

How to create the user with the specific UID

chirag@chirag-MacBookAir:~$ useradd -u 3000 username

How to change the password

chirag@chirag-MacBookAir:~$ passwd username

How to add secondary group

chirag@chirag-MacBookAir:~$ usermod -a -G dhawal chirag (dhawal is added to the chirag)

How to get help

chirag@chirag-MacBookAir:~$ useradd -- <tab><tab>

How to set shell

chirag@chirag-MacBookAir:~$ usermod -s /bin/bash

How to create user with existing directory

chirag@chirag-MacBookAir:~$ useradd chirag -d /home/qwer
chirag@chirag-MacBookAir:~$ usermod -m -d /var/www/html nobody

How to allow nobody user in apache group (nobody wants to access same permission of apache)

chirag@chirag-MacBookAir:~$ vim /etc/group
apache:::nobody