1. Java

http://www.javacjava.com/Tutorials.aspx

2. Perl

http://www.perl.org

3. mkdir -p {usr,sbin}/{share,opt} , root@debian:~# cp /etc/postfix/main.cf{,.backup}

4. Vim Perl short-cut

– Adding Perl subroutine using \isu

– Inserting funtion using \cfu

– Adding frame comments using \cfr

5. https://stackoverflow.com/questions/4331092/finding-all-combinations-of-javascript-array-values