use of mdfind, a cmd tool for mac os x spotlight: http://www.macdevcenter.com/lpt/a/6403

ps hints: http://www.macosxhints.com/article.php?story=20050716043923421&lsrc=osxh

A list of Mac specific command line command: http://www.macosxhints.com/article.php?story=20050706102444691&lsrc=osxh

Useful command: open
http://www.imacguru.com/sections.php?op=viewarticle&artid=21

Short tutorial of ssh/scp keygen
http://www.imacguru.com/sections.php?op=viewarticle&artid=76

清除 arp 表內資料能加速 SSH 連線 (haven't tried yet...)
http://www.imacguru.com/sections.php?op=viewarticle&artid=29

Get the daily change file, nice to put as cronjob for security check
find / -mtime -1 -print