Commands by patko (7)

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rot13 simple substitution cipher via command line
E.g. Useful for hiding spoilers in reviews, etc.

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

show where symlinks are pointing
displays the output of ls -l without the rest of the crud. pretty simple but useful.

Testing ftp server status
I must monitorize a couple of ftp servers every morning WITHOUT a port-scanner Instead of ftp'ing on 100 ftp servers manually to test their status I use this loop. It might be adaptable to other services, however it may require a 'logout' string instead of 'quit'. The file ftps.txt contains the full list of ftp servers to monitorize.

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

Mapreduce style processing
parallel can be installed on your central node and can be used to run a command multiple times. In this example, multiple ssh connections are used to run commands. (-j is the number of jobs to run at the same time). The result can then be piped to commands to perform the "reduce" stage. (sort then uniq in this example). This example assumes "keyless ssh login" has been set up between the central node and all machines in the cluster. bashreduce may also do what you want.

Top 10 Memory Processes
It displays the top 10 processes sorted by memory usage

Download an Entire website with wget

List all files modified by a command
This lists all files modified after calling some command using a temporal anchor.

list files recursively by size


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