e2undo

Replay undo logs for an ext2/ext3/ext4 filesystem. This can be used to undo a failed operation by an e2fsprogs program. More information: https://man7.org/linux/man-pages/man8/e2undo.8.html.

• Display information about a specific undo file:
  e2undo -h {{path/to/undo_file}} {{/dev/sdXN}}
• Perform a dry-run and display the candidate blocks for replaying:
  e2undo -nv {{path/to/undo_file}} {{/dev/sdXN}}
• Perform an undo operation:
  e2undo {{path/to/undo_file}} {{/dev/sdXN}}
• Perform an undo operation and display verbose information:
  e2undo -v {{path/to/undo_file}} {{/dev/sdXN}}
• Write the old contents of the block to an undo file before overwriting a file system block:
  e2undo -z {{path/to/file.e2undo}} {{path/to/undo_file}} {{/dev/sdXN}}