Here are a few reference cards (refcards) I found and locally mirrored. I use some, I kept the others just in case. Best viewed with a printer and folded :)
Bash & Perl :
Bash quick reference card (7 pages, pretty good)
regexp quick reference card (really love this one)
Perl 5 reference (31 pages)
PerlWin32 quick reference card
Linux :
OnePage Linux Manual (good newbie sheet)
Linux Admin quick reference card
Linux Security quick reference card (need sharp eyes)
Linux Syscall quick reference card
Web software :
Apache quick reference card (very good and complete in 2 pages)
mod_perl
MySQL 4 quick reference card (Very good)
PHP4 quick reference card (too short to be really useful)
Web related :
CSS 1.0 quick reference card
CSS 2.0 quick reference card
DOM HTML 2 quick reference card
xhtml-1.0-frameset quick reference card
xhtml-1.0-strict quick reference card
xhtml-1.0-transitional quick reference card
XSL 1.0
xtm-1.0 quick reference card
Editors :
Vi (cool for newbies stuck in shell with no pico available)
TeX
VIM
XEmacs
Other Softwares and Misc :
The Gimp quick reference card
Photoshop quick reference card
TclTk reference (26 pages)
tcpdump quick reference card
C (ansi)
CVS
Delphi Technical Reference
GNU Calc
JSP
Shorter URL
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Quick Reference Cards
I love these reference cards. A double sided page, three columns, with just the essentials for quick reference. Test::More mod_perl…
cool, del.icio.us, printer