User administration scripts

GNU/Linux is a multiuser operating system that allows many users to log in and perform activities at the same time. Administration tasks involving user management include setting the default shell for the user, adding a user to a group, disabling a shell account, adding new users, removing users, setting a password, setting an expiry date for a user account, and so on. This recipe demonstrates a user management tool to handle these tasks.

How to do it...

This script performs common user management tasks:

#!/bin/bash 
#Filename: user_adm.sh 
#Description: A user administration tool 

function usage() 
{ 
  echo Usage: 
  echo Add a new user 
  echo $0 -adduser username password 
  echo 
  echo Remove an existing user 
  echo $0 -deluser...