Some random links that have been helpful (and/or interesting)as I am starting to learn Linux.

• IBM Windows to Linux Roadmap

Tips for a new installation of Redhat Linux:

• Create a backup root account by running (as root) the vipw command, copying the line for root, and changing the name.
  More info about passwd and shadow file can be found at: Linux Admin Made Easy
• Use passwd NEW-NAME to change the password for the backup ID.
• Run chage NEW-NAME to check and/or change the password expiration for the backup ID (and perhaps other IDs on your system).