How to "UNDELETE" something deleted recently

recover_file.sh

#!/bin/bash

####
## NOTE: Change /dev/sda1 to the name of the device partition you
## deleted the file on.
# Also "x" needs to be big enough to hold the file contents.
###

grep --binary-files=text --context=x 'stringfromyourfile' \ /dev/sda1 > someFile.txt

###
# BONUS: To find something still in RAM, use something like
# this: if we are searching for a phone number that starts with
# 717
###

`strings < ramdump | grep "717" `

#### The best way for big files or other filetypes is to use the 
#### command debug2fs http://www.linuxvoodoo.com/resources/howtos/debugfs