Linux.com demonstrates how to gather information via the command-line in this tutorial.
There are lots of ways the CLI can help you. Often, you don't need to do something so much as you need to know something. This week we'll take a quick look at several commands -- whereis, whatis, df, kernelversion, ifconfig, route, and last -- that can quickly answer questions about your system or configuration. Wipe that GUI mess out of your eyes and meet me at the CLI.
Where is that darn command?
You know the command is on your system, because you've used it before. But now you can't remember where it lives. Is it in /sbin? Or /usr/bin? Somewhere else? The whereis command is designed to answer that very question. In fact, whereis will tell you not only where to find the executable command, but the source code -- if it's present -- and man pages as well. All you need to do is ask, by providing the name of the command you're looking for:
