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I am a newbie, but I think that all commands are the same when typed at the command line. Redhat and Mandrake should have the same command line commands, since both are Linux. The way I understand it is Redhat, Mandrake, SuSE, etc are all dist. of Linux, with a few changes. But I think the command line commands are the same since they are all Linux. I think this is right. Someone correct me if I am wrong.
If all command lines are the same, you might be able to find a cheat sheet online.
All answers above are true, just a quick comment to keep things in perspective. Linux has originated from Unix, hence most of user command line utilities are identical across all Unix *AND* Linux versions. Differences lie in the administration and front end GUIs (Graphical User Interfaces).
As for command line vs. source code, these are two completeley different beasts. Command line is used to enter interactive commands, whereas source code is a file containing program listings (as typed by a programmer), before such program was compiled into an executable file. What you type at the command line may be an executable, but it may also be a script (file containing other commands).
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Just a note about the commands. In Linux (and other Unices) the user can specify wich shell (command line to use). The most widely used and most popular is bash (Bourne again shell) but some users prefer differents shells such as csh, korn, etc...
By default you always have bash, and most Unices use bash by default.
If im confusing you then just ignore this
Just one correction, on Unix you have sh (bourne shell), ksh (Korn shell) and csh. These days ksh is the default - not bash.
bash may be added, being open source, but is not a default.
Most Unix shell scripts used sh historically, slowly now moving to ksh
You might want to get a book on Linux to help. O'Reilly's "Running Linux" is good though parts are somewhat out of date; so when it talks about configuration later on in the book make sure it is valid.
I see that you're new to programming. Some books or online resources on programming would be good. Tutorials on Python would be helpful; Python seems to be a good beginner's language and is even useful for real-world stuff too. (I like some other languages better but they wouldn't be a good first language.)