20 Linux System Monitoring Tools Every SysAdmin Should Know

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

Understanding VirtualCenter Performance Statistics

http://communities.vmware.com/docs/DOC-5230

Howto use VMware esxtop

Official documentation http://www.vmware.com/info?id=193

Nice article http://www.hypervizor.com/2009/06/interactive-replay-batch-esxtop-modes/

Killing a frozen VM on a vSphere ESX host

http://itknowledgeexchange.techtarget.com/virtualization-pro/killing-a-frozen-vm-on-a-vsphere-esx-host/?track=NL-915&ad=710968HOUSE&asrc=EM_NLN_8048495&uid=5373778

PERL Getopt and GetOptions

When you code unix program first of all you need to get user options. Two Perl modules (Getopt and Getoptions::Long) work to extract program flags and arguments much like Getopt and Getopts do for shell programming. The Perl modules, especially GetOptions::Long, are much more powerful and flexible.

See full article at http://aplawrence.com/Unix/perlgetopts.html

Ultimate Deployment Appliance

Unattended OS installations (Windows, Linux, ESX, Solaris) over the network set-up in minutes! Look at http://www.ultimatedeployment.org/