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Calculating PUE

Power Usage Effectiveness (PUE) Power Usage Effectiveness (PUE) is a standard developed by The Green Grid‚Ñ¢ consortium to provide a clear answer to the primary issue surrounding energy efficiency within the data center which is how much power is devoted to driving the actual computing/IT components (servers, for example) versus the ancillary support elements such […]
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Get Parent PID

Get Parent PID [perl] my $parent_id = getppid(); print "$parent_id\n"; [/perl] NAME getppid – get parent process ID SYNOPSIS getppid DESCRIPTION Returns the process id of the parent process. DISCLAIMER We are painfully aware that these documents may contain incorrect links and misformatted HTML. Such bugs lie in the automatic translation process that automatically created […]
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SCCS – script header

SCCS – script header While sccs checked out a file, add these lines to the top of your script to preserve versions and file information. [bash] # Master: %P% # SCCS id: %Z% %M% %I% %E% [/bash]
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Perl – Lock Files (flock)

Perl – Lock Files (flock) The following script is an example of using lock files in Perl. This prevents more than one user or process accessing a file at a time. [perl] use Fcntl qw(:DEFAULT :flock); use Fcntl ‘:flock’;¬†¬†¬†¬† #LOCK_* constants my($lockneedsremoving)=0; my($lockfilename)=”/var/.pwd.lock”; unless (createlock()) { print “Lock has been created”; print “This is only […]
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VNC server on Unix

VNC server on Unix Starting the VNC server on Unix for the First time VNC Server installs in /usr/local/bin, you need to make sure you have both /usr/local/bin and /usr/openwin/bin in your path, also the first time you run vnc you need to setup a vnc password, this is done with the /usr/local/bin/vncpassword command. After […]
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