Whats a good way to recover deleted files? Linux

Well I checked and the file system is EXT3 so there is almost no chance of recovery. The thing is that they say using grep, I might have a chance to recover some of the files.

Now I've google for a few hours now and I can't seem to find any instructions at all on how to use. What I deleted was a rather large folder -video files- so how do I go about doing it? Anyone give me a quick advice?

folder is in the /home/blahblah

They say the command is "grep -a -B[size before] -A[size after] 'text' /dev/[your_partition]"

I wonder seem to quite understand.. if I'm recovering videos -say a few gigs- what kind of thing would I put int?

 

 

 

 

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