tldr/pages/linux/e2undo.md

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# 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}}`
- 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}}`