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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"

combining streams
2>&1 permit to combinate stdout and stderr. grep will catch stderr and stdout instead of stdout only.

Fast, built-in pipe-based data sink
This is shorter and actually much faster than >/dev/null (see sample output for timings) Plus, it looks like a disappointed face emoticon.

See the top 10 IP addresses in a web access log

Use default value if unassigned
Will use variable value (for variable $my_dir, in this case), an assign a default value if there is none.

A function to output a man page as a pdf file
Tested on Fedora 12. This function will take a man page and convert it to pdf, saving the output to the current working directory. In Gnome, you can then view the output with "gnome-open file.pdf", or your favorite pdf viewer.

lists files and folders in a folder
lists files and folders in a folder with summary.

use xxd to create the wake on lan magicpacket and write to pcap file
just set macdst to the mac address of the system you wish to wake up, the macsrc is optional but helps use tcpreplay to broadcast or wireshark to view

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

Change the case of a single word in vim
In edit mode, toggle the case of a single word under the cursor in vim.


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