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Merge Multiple PDFs
Merge Multiple PDFs In Alphabetical Order

Get a list of the top 10 heaviest tables in your mysql database - useful for performance diagnostics

Replace Caps-lock with Control-key
You can return to defaults with "setxkbmap". More here: http://dailycli.blogspot.com/2009/12/xmodmap-replace-caps-lock-with-left.html

Use Linux coding style in C program
put "-linux" option into $HOME/.indent.pro to make it default

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Change tha mac adresse
eth0 = the name of the interface 00:01:02:03:04:05 = the new mac adresse the same thing for wireless card $ sudo iwconfig eth1 hw ether 00:01:02:03:04:05

Create a html of information about you harddisk
www.fir3net.com

Identify differences between directories (possibly on different servers)
This can be much faster than downloading one or both trees to a common servers and comparing the files there. After, only those files could be copied down for deeper comparison if needed.

Convert a string to

Generate random IP addresses
It never ends


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