Linux imp commands

http://www.fromdev.com/2008/12/debugging-java-on-unixlinux-my-favorite.html

TCP Network analysis

http://www.cyberciti.biz/tips/linux-investigate-sockets-network-connections.html

Determine Threads with High CPU usage

http://blogs.manageengine.com/appmanager/2011/02/09/identify-java-code-consuming-high-cpu-in-linux-linking-jvm-thread-and-linux-pid/

Convert Decimal to hexaecimal:
http://www.mathsisfun.com/binary-decimal-hexadecimal-converter.html

Webserver precompress static files

http://mark.aufflick.com/blog/2007/12/06/serve-pre-compressed-content-with-apache

JBOSS ACCESS LOGS

http://docs.jboss.org/jbossweb/2.1.x/config/valve.html

Linux Admin Essentials performance and more

http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html