Command Line Next Steps

You have completed the crash course. At this point you should be a barely capable shell user. There's a whole huge list of tricks and key sequences you don't know yet, and I'm going to give you a few final places to go research more.

Unix Bash References

The shell you've been using is called Bash. It's not the greatest shell but it's everywhere and has a lot of features so it's a good start. Here's a short list of links about Bash you should go read:

Bash Cheat Sheet
https://learncodethehardway.org/unix/bash_cheat_sheet.pdf created by Raphael and CC licensed.
Reference Manual
http://www.gnu.org/software/bash/manual/bashref.html

PowerShell References

On Windows there's really only PowerShell. Here's a list of useful links for you related to PowerShell:

Owner's Manual
http://technet.microsoft.com/en-us/library/ee221100.aspx
Cheat Sheet
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=7097
Master PowerShell
http://powershell.com/cs/blogs/ebook/default.aspx

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