What is are buffer overflow attacks?

Here is a very helpful article on Buffer Overflow Attacks and Their Countermeasures.

Great post on using SSH and SCP on irregular ports

If you're trying to figure out how to use SSH on irregular ports, check out this article titled Correct syntax for using SSH and SFTP on Ubuntu on irregular ports.

I also found it useful for figuring out how to use the scp (secure copy) command between two different servers when root login is disabled.

Best article on Using tar to archive

Found this article on Using tar to archive. Really good, step-by-step instructions.

Worthwhile, practical resource

I just discovered the Seeksadmin blog, which has some fantastic articles on server security, including the following:

• Simple Server Security
• Basic SSH Security
• Password Management

I'm looking forward to reading more gems from the Seeksadmin blog in the future.

CentOS Download Sites and Mirrors

Download page on CentOS.org

Before downloading, the CentOS team would like to remind you that the primary means of sustaining the development of CentOS is via contributions by users such as yourself. CentOS is now and will continue to be totally free; however, it takes money and resources to make CentOS available. If you are able, please consider donating to the CentOS Project.

Specific download links for CentOS versions:

• CentOS-5 ISOs
• CentOS-4 ISOs
• CentOS-3 ISOs
• CentOS-2 ISOs

Awesome Linux Training Provider: SpiderTools.com

An extremely exciting find: SpiderTools.com, which provides live online and asynchronous online/CD-ROM training courses on just what I need: basix Linux administration. This is perfect for daily 3 to 4 hour train commutes to work!

Books and CDs
Build a Computer on DVD for $12.95 dollars
Linux Newbie Book for $24.95
10 Point Security Check for $6.95

Asynchronous (Self-Paced) Courses
Basic Server Administration Workbook for $89.95
Linux Server Administration Six-Pack for $149.95

Synchronous (Live) Courses
Catalog of Real Training on Real Servers (Remote Access) from $149.00 to $1200.00

Introduction to Unix Commands

Introduction to Unix commands from Indiana University Knowledge base

This is a very brief introduction to some useful Unix commands, including examples of how to use each command. For more extensive information about any of these commands, use the man command installed on your system.

Commands

cal	cat	cd	chmod
cp	date	df	du
find	jobs	kill	less and more
lpr and lp	ls	man	mkdir
mv	ps	pwd	rm
rmdir	set	vi	w and who

Sources for more information appear at the end of the online documentation.