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Convert a SVG file to grayscale
It requires inkscape 0.46 and lxml packages

Compare a remote file with a local file

Show directories in the PATH, one per line
This version uses Pipes, but is easier for the common user to grasp... instead of using sed or some other more complicated method, it uses the tr command

Human readable directory sizes for current directory, sorted descending

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

histogram of file size

Sort the size usage of a directory tree by gigabytes, kilobytes, megabytes, then bytes.
Probably only works with GNU du and modern perls.

small CPU benchmark with PI, bc and time.
$ # 4 cores with 2500 pi digits $ CPUBENCH 4 2500 $. $ every core will use 100% cpu and you can see how fast they calculate it. $ if you do 50000 digitits and more it can take hours or days

Use tagged vlans
Great for sysadmins! Don't forget to pass the vlan to your port in a manageable switch. After vconfig, you should use $sudo ifconfig eth0.[VID] up Now the interface is up, you can use dhclient or ifconfig again to get an ip address.

calculate how much bogomips one cpu core has (assuming you have 4 cores).
on some distro's you have to replace "BogoMIPS" with "bogomips".


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