Unix is an operatating system with many different versions primarily used in networking or servers. Although it is a tough operating system it has its advantages because it's powerful, stable and flexible. With unix commands it's necessary to realize that it is case sensitive. Unix is a fairly universal program and you can do alot with once in the program itself. Unix man pages are part also of the Unix operating system.
Man pages work like the actual manual in explaining various functions in the program.
The information is useful and the explanations are a bit more in depth. Though the commands are a little confusing, once you get the hang of it the pages are very helpful to have around. Pico is a fairly simple text editor. Pico commands are a little different and they appear on the bottom of the screen. They usually require using the control key along with a letter.