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"disk0s2" in the command is the identifier for the hard drive. Your's might be different, so you can check using Disk Utility (located in Applications/Utilities). Just click on the hard drive in the list on the left and choose Get Info... from the File menu (Command-I). The Disk Identifier property is near the top of the info window.
The second part of the command is awk which rearranges the output. You can change this arround. Just make sure all text is inside double-quotes, and all variables (e.g. $2) are outside. $2 gives the capacity, $3 gives the used, $4 gives the free, and $5 gives the percentage used.
By default it is set to update once daily, however you may want to change that to more often.
Command: df -hl | grep 'disk0s2' | awk '{print $4"/"$2" free ("$5" used)"}'
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