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calulate established tcp connection of local machine
If you want prepend/append text just wrap in echo: $echo Connected: `netstat -an|grep -ci "tcp.*established"`

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

Show IP Address in prompt --> PS1 var
when working with many machines in a computer lab need to know the IP addr is very large, this is a simplistic solution to make things easier

check open ports
Tested in Linux and OSX

Use Perl like grep
Much better alternatives - grep-alikes using perl regexps. With more options, and nicer outputs.

google chart api
http://chart.apis.google.com/chart?chs=450x200&cht=p3&chtt=Browser+Usage+on+Wikimedia&chl=IE%2834.2%%29|Firefox%2823.6%%29|Chrome%2820.6%%29|Safari%2811.2%%29|Opera%285.0%%29|Android%281.9%%29|Other%283.5%%29&chd=t:34.2,23.6,20.6,11.2,5.0,1.9,3.5

Makefile argument passing
This would allow reference of $(VAR) (if defined) with the value 'foobar' within the Makefile.

View the current number of free/used inodes in a file system
tune2fs also provides the same information . But the information does not give the current usage , it gives the information when the file system was last mounted. http://www.zaman4linux.in/2010/10/using-up-all-the-free-inodes.html

List last opened tabs in firefox browser

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"


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