IT Commands

du -h --max-depth=1

Peal module
perl -MCPAN -e shell;

cpan> install HTTP::Heahers
cpan> install HTTP::Cookies
cpan> install LWP::UserAgent

s/primary.*/& hello

CSV
-d dir
-diff
-co
-status
-commit
-update
-add
-add -kb (binary only)