Are operating system commands system unique?
 

So... My computer has its own server-like thing that I use to develop my scripts, but my web server is Linux.

If I start getting into operating system commands will I need to like... make the same command for both OS's? What is the deal here?

And your own computer is Windows?

How do you mean "system commands", command line scripts? or system commands in php?

Uhh... I am pretty sure it is command line scripts...

And yes, I have a windows computer with WAMP.

No, it is using Operating system commands. Like dir for windows and ls for linux/unix

And while we are at it... I need to learn more about timestamps and how to convert them to normal times or dates...

You mean shell commands. And the answer is mostly yes. Avoid using shell commands very much, though (it's ok to use mysqldump or mysqlimport for example - they are the same on both *nix and windows). Why do you need them so badly? Write a library in PHP that does the same thing, if it's not a common FS operation or such.

date(): PHP: date - Manual