I once heard an author say that when you are a child you use a computer by looking at the pictures. When you grow up, you learn to read and write. Welcome to Computer Literacy 101. Now let's get to work.initial confusion of the command line, then you are likely beginning to see it's value as a programmers tool and are ready to start wading towards the deep end. This is the comprehensive text that will take you there: The Linux Command Line: A Complete Introduction.
And don't let the title scare you away if you aren't committed to Linux. A lot will be the same and all the concepts are still relevant for any UNIX-like system (OSX, Solaris, BSD).
Shotts' has also contributed his hard work to the free knowledge of humanity by releasing it under a Creative Commons license. You can download the PDF if you are student short on cash or just want to kick the tires.