Well the question of the commands are quite complicated... but usually all the programs have a very intuitive name... so you may find very easily the name of a certain application.
What you may usually use is the <tab> key... to auto-complete your command. For example if you are not sure about firefox command name, you just try "firefox<tab>", or "mozila<tab>" and you will see some alternatives, and you will see that some of them will be for sure more appropriate to your intents...
So, in my opinion you just have to try to deduce the most appropriate name of the app that you want to run.
A very trick way to find out a command that do some kind of thing that you want is the "apropos" command. Basically if you want to do something, like mail client, you may write "apropos mail"... and you will get lot of information about mail stuff...
The best way to deal with the commands... is just to practice and play with them... and use the "man" to help you to figure out what they mean...
See you
/Edu
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