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Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Decode base64-encoded file in one line of Perl
Another option is openssl.

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"

Assign function keys to your frequent commands
This is a common use of bind. Hitting any key after will output the key's character sequence. This makes possible using it into a bind command. So pressing ctrl+v and then F2 will output "^[[12~", once binded every time you'll press the function key F2 it will execute your command. Added the \n to make it execute it as well.

Rsync a directory excluding pesky .svn dirs

Convert text to picture
generates a picture file with the text. Some other samples in: http://www.imagemagick.org/Usage/text/

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

Check if you work on a virtual/physical machine in Linux
Command used to know if we are working on a virtual or physical machine. This command will use the dmidecode utility to retrieve hardware information of your computer via the BIOS. Run this command as root or with sudo.

import gpg key from the web
imports a public key from the web. I know this by head.. but useful nevertheless

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


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