By mistake i deleted imp folder which as certain imp files created, so i want to reterive it ? is it possible by using any specific linux commands only

You can't easily 'un-rm' a file, unfortunately. The data are still there on disk, but all links to them in the file system table are removed. That's actually what rm does; it deletes the link to the file(s) in the file system table and frees the space so it can be used by other files in the future.

Using some (non-standard) software, it's possible to analyze the hard disk to find deleted files that haven't yet been overwritten. Using even more sophisticated hardware AND software, it's sometimes possible to recreate files that have only been overwritten once. Programs like shred overwrite the disk multiple times with random data specifically to thwart such methods.

Short answer... NO.

You have to use a live medium with testdisk installed. You can then use the photorec program to recover files that are not overwritten now.
I hope you have learned to lessons from that accident:
1. Always have a backup
2. Be extremely careful when working with commands like rm or dd, you can damage your system or loose important data (if no backup was made)

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Depends, what file system are you running? I know from experience for instance that '#> reiserfsck --rebuild-tree /dev/**** works well. And from what I recall there are other methods available for other journaled file systems too. Google is your friend. The important thing to do is not write anything else to disk until you have recovered the data.

BashTin