Resources for GNU/Linux and Programming
Linux
Books
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The Linux Command Line by William Shotts (free ebook)
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Introduction to Linux (2008) — the Linux Documentation Project
Distribution Specific
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The Debian Administrator's Handbook — a comprehensive user manual for Debian
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Debian Reference manual — a user's guide with the focus on the command line
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Arch Linux Wiki — in-depth documentation for Arch Linux and any software that can run on it. Extremely useful resource for any Linux user.
Linux News
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LWN.net — news about Linux development and other Free software
Shell Scripting
The Linux Documentation Project
Greg's Wiki
These guides provide a number of useful tips and recommendations for avoiding common mistakes and errors when using bash.
Emacs and Emacs Lisp
These are also readable from within Emacs (C-h i) or with the info
command.
Note: On Debian the documentation is not included by default but can be
installed with the emacs-common-non-dfsg package from the non-free
repository.
Xah Lee's Web Guides
Xah Lee is a prolific blogger who has been apart of the the Emacs community for many years. He has written a number of straightforward Emacs tutorials.
These guides are completely free so consider donating to Xah Lee or buying an offline version of these guides.
Mastering Emacs
Emacs News
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Sacha Chua writes a weekly roundup's of Emacs news on her blog
Common Lisp
Books
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Practical Common Lisp by Peter Seibel (free ebook)