RUBY stuff  

• wikibooks ruby programming collection
• Programming ruby : the pragmatic programmers guide 
• Top 12 ruby on rails tutorials
• Rubyforge - code repository 
• Learning ruby  
• Things that newcomers to ruby should know 
• Ruport - the ruby reporting framework
• Piston - Easy Vendor branch management 
• Rdoc usage - Generate usage from comments (very useful) 
• Xruby - Compiles ruby code to java byte code (.class)
• Kwala - Ruby source code build and quality checker 
• Ruby tutorial for PERL programmers :-)
  

Linux Links:

 Perl :

•  The O'Rielly perl bookshelf
•  RxEx tutorial