Useful links

UNIX commnads in various flavours .
http://www.bhami.com/rosetta.html

PERL Scripting :
http://www.cs.cf.ac.uk/Dave/PERL/

Orcle FAQ ( Useful site for basic information)
http://www.orafaq.com/faqdbapf.htm

Database online Performence Tuning Book.
http://www.amazon.com/gp/reader/0201791692/ref=sib_dp_pt/102-0176682-9619376#reader-page