Linux and Unix are the most powerful command line operating systems. Though we have GUI for both of them but the command line utilities still play very powerful role when it comes to managing the system configuration. When it comes to networking, Linux and Unix are the most secured choice because networking is tightly integrated with operating system and there are lot of tools available to manage it.

Network Commands on Linux / Unix

1. ftp : Transfer files to another host (insecure)
2. host: Get information about networked host.
3. ifconfig : Display Ip address information.
4. netstat: Display routing information and network stastics
5. ip: Display Ip address information.
6. ping: Sends answer request to other hosts.
7. rdesktop: Display MS Widnows desktop on Linux Machine
8. route: Show routing information
9. scp: Secure copy files to and from another host.
10. sftp: Secured ftp
11. ssh: Make an encrypted connection to another host.
12. ssh-keygen: Generates authentication keys for SSH
13. telnet: Make an insecure connection to another host.
14. tracepath/traceroute: Prints the packet and time taken for hops to a host.
15. whois: Get information about a domain name.
16. xclock: X window clock application, handy for testing remote display.
17. xhost: X window access control tool.

These commands can be useful specially if you are a power user. There are GUI options available but then when it comes to get quick things done in a smart way, being a power user always pay.