Useful Unix System Administration Commands

I always forget Unix commands to do useful things, so I am just going to list them here:

Update the DB that locate uses:

• updatedb

Add a default startup script:

• Gentoo:
  rc-update add "script_name" default
• Ubuntu:
  update-rc.d "script_name" defaults

Rebooting:

• shutdown -r now

Creating Public Keys

• ssh-keygen -t rsa

Name Server Lookups

• Get cached names servers:
  host -t ns survv.org
• Get records from a given name server:
  host survv.org ns1.anilmakhijani.com

Zipping and Unzipping

• files.tar.bz2: bzip2 -cd files.tar.bz2 | tar xvf -

IP Tables

• Show IP Routing Table: route -n