Linux is a free and open source kernel that powers a variety of
operating systems for servers, desktops, laptops, netbooks,
mobile phones, and many embedded devices. If you have your own
Linux server, you have probably used SSH to access the command
line on at least a few occasions when your web-based control
panel simply would not suffice. The following are eight commands
you can use in Linux that will save you time, energy, and maybe
even money. 1. grep - While you could simply describe grep as a
search tool, it is really so much more. You can filter long
lists, scour documents for the most obscure detail, and make
other commands behave differently according to your
specifications. ls -al | grep make 2. ps - When you need to
figure out exactly what is going with your server, ps is
invaluable. In its most basic functionality, it lists processes
(instances of programs currently running). With a few choice
flags, you can view process IDs, memory and CPU usage, command
names, and even parent and child processes