This is a quick reference guide on how to check your network interfaces on Linux Based Operating Systems.
1. ifconfig -a
root@FTP1:~# addgroup ftpgroup user1
addgroup: The user `ftpgroup' does not exist.
root@FTP1:~# adduser user1 ftpgroup
Adding user `user1' to group `ftpgroup' ...
Adding user user1 to group ftpgroup
root@FTP1:~# adduser user2 ftpgroup
Adding user `user2' to group `ftpgroup' ...
Adding user user2 to group ftpgroup
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