data recovery tools for debian (command line)

[Muhammad Yousuf Khan <sirtcp@gmail.com>]

if i mistakenly delete any partition or OS or HD corrupted. what is
the best tool that i can use to recover the data in these situations.

just wanted to test this stuff in my test environment.

note : i work with command line only. so preferably tool should be
command line supported. since i don't like to use mouse :-)

Thanks