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git diff of files that have been staged ie 'git add'ed

Shows physically connected drives (SCSI or SATA)
This will show all physically connected SATA (and SCSI) drives on your system. This is particularly useful when troubleshooting hard disks.... or when a mount point seems to be missing.

Copy all documents PDF in disk for your home directory
I used this to copy all PDFs recursively to a selected dir

Given $PID, print all child processes on stdout
Simpler.

Start a game on the discrete GPU (hybrid graphics)
On laptops featuring hybrid graphics and using the free X drivers, the DRI_PRIME variable indicates which GPU to run on. This alias allows to utilize the faster discrete GPU without installing proprietary drivers.

Get the current svn branch/tag (Good for PS1/PROMPT_COMMAND cases)
uses just one sed

list block devices
Shows all block devices in a tree with descruptions of what they are.

Check reverse DNS
I'm just a simple programmer. I find dig too verbose. host tells me alias(es) and IP address in a quick to grok format with nothing special to remember for input parameters. With thanks to http://www.cyberciti.biz/faq/how-to-test-or-check-reverse-dns/

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"

Get MD5 checksum from a pipe stream and do not alter it


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