Quickies: bash calculation basics

http://linuxaria.com/article/doing-calculations-using-bash?lang=en

Quickies: open a port from the command line

http://www.upubuntu.com/2012/01/how-to-open-specific-port-under-ubuntu.html

Simplify syncing with Unison

http://olex.openlogic.com/wazi/2012/unison-makes-two-way-file-sync-simple/

Disable your network adapter(s) at startup (Ubuntu)

http://www.upubuntu.com/2012/01/how-to-disable-your-network-adapter.html

Free programming book collection

http://citizen428.net/blog/2010/08/12/30-free-programming-ebooks/

Drupal in 30 minutes

http://olex.openlogic.com/wazi/2012/from-zero-to-drupal-in-30-minutes/

Forget your root password?

http://linux-news.org/index.php/2012/01/04/forgot-the-root-password-of-your-linux-box/

Replacements for deprecated network commands

https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements/