(Best resources for answering general or specific questions about Linux.)
http://en.wikibooks.org/wiki/GNU_&_Unix_Commands_(LPIC101∞) GNU & Unix Commands (LPIC101) From Wikibooks, the open-content textbooks collection
http://linux.about.com/od/commands/l/blcmdl.htm∞ Linux Command Library (Man Pages)
Places for further advice and help
Other Links
http://bashdb.sourceforge.net/∞ BASH with Debugger and Improved Debug Support and Error Handling
http://www.neosoft.com/neosoft/man/bash.1.html∞
http://www.faqs.org/faqs/unix-faq/shell/bash/∞ [gnu.bash.bug] BASH Frequently-Asked Questions (FAQ version 3.26)
http://www.shelldorado.com/∞ Heiner's SHELLdorado SHELLdorado - your UNIX shell scripting resource
http://www.softpanorama.org/Scripting/shells.shtml∞ Shellorama (A Slightly Skeptical View on Shell Scripting)