tldr/pages/linux/e2undo.md

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://manned.org/e2undo.

• Display information about a specific undo file:

e2undo -h {{path/to/undo_file}} {{/dev/sdXN}}

• Simulate replaying the undo file and display the candidate blocks:

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 [v]erbose information:

e2undo -v {{path/to/undo_file}} {{/dev/sdXN}}

• Write the old contents of the block to an undo file before overwriting a filesystem block:

e2undo -z {{path/to/file.e2undo}} {{path/to/undo_file}} {{/dev/sdXN}}