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by antm 4856 days ago
Peepcode has a great set of quality, affordable, screencasts. I went through them both and they helped a ton.

https://peepcode.com/products/meet-the-command-line

https://peepcode.com/products/advanced-command-line

Experimentation is another good option, and goes a long way, but it can be scary. If you're at all worried about doing permanent damage, install a virtual machine (i.e. VirtualBox + the server version of Ubuntu or whatever OS you want). That way you can experiment away without fear of doing permanent damage. If it happens just trash the the VM and start again.