The commands given below make up only a very small portion of the total available. Each command has none or many, many options to satisfy anybody's taste. Among other things, it is this incredible richness which has many serious UNIX users stick with commands to be typed rather then switch over to graphical interfaces with buttons to click on.
You frequently will see the phrase "egghead%" in this right-up. This is what we call the command prompt which appears whenever a particular command or program has executed. It basically tells you that the computer is done with the previous task and is waiting for you to type in another command. The prompt "egghead%" stems from the computer I worked on when I created these pages. You will see something like :
[xyz123@istxx ~] or [xyz123@ist13 ~www]
The xyz123 stands for your userID , istxx for the computer you are sitting in front of and ~ or ~/www or something else for the present working directory. This sequence of characters is called the prompt which is followed by the text cursor. It will look differently on other UNIX machines, sometimes very differently. The prompt followed by the text cursor is an indication that the computer is waiting for you to type in a command.
If you are brandnew to the UNIX world I recommend you read up about the different commands in the order they are listed below and doing the examples presented for each command as you go along.