Script to create a user if it does not already exist in Linux

Script to create a user if it does not already exist in Linux.

The gist below does the following:

• Check for SuperUser Privileges. If not present, It adds sudo before executing the commands that needs root/su privileges.
• Checks if the user already exists or not.
• Creates a new user with the given USER_NAME and PASSWORD.

Note: package ‘whois’ is reqiured for mkpasswd to work

      sudo apt-get install whois