From LQWiki

This article gives hints about how to undelete or recover an accidentially-deleted file.

Applications

• Magic Rescue - scans a block device for file types it knows how to recover and calls an external program to extract them
• Foremost - console program to recover files based on their headers, footers, and internal data structures

Tutorials

• http://www.ists.dartmouth.edu/classroom/file-recovery.v0.81.php - use midnight commander to undelete files