e2undo(8) — Linux manual page


E2UNDO(8)                  System Manager's Manual                 E2UNDO(8)

NAME         top

       e2undo - Replay an undo log for an ext2/ext3/ext4 filesystem

SYNOPSIS         top

       e2undo [ -f ] [ -h ] [ -n ] [ -o offset ] [ -v ] [ -z undo_file ]
       undo_log device

DESCRIPTION         top

       e2undo will replay the undo log undo_log for an ext2/ext3/ext4
       filesystem found on device.  This can be used to undo a failed
       operation by an e2fsprogs program.

OPTIONS         top

       -f     Normally, e2undo will check the filesystem superblock to make
              sure the undo log matches with the filesystem on the device.
              If they do not match, e2undo will refuse to apply the undo log
              as a safety mechanism.  The -f option disables this safety

       -h     Display a usage message.

       -n     Dry-run; do not actually write blocks back to the filesystem.

       -o offset
              Specify the filesystem's offset (in bytes) from the beginning
              of the device or file.

       -v     Report which block we're currently replaying.

       -z undo_file
              Before overwriting a file system block, write the old contents
              of the block to an undo file.  This undo file can be used with
              e2undo(8) to restore the old contents of the file system
              should something go wrong.  If the empty string is passed as
              the undo_file argument, the undo file will be written to a
              file named e2undo-device.e2undo in the directory specified via
              the E2FSPROGS_UNDO_DIR environment variable.

              WARNING: The undo file cannot be used to recover from a power
              or system crash.

AUTHOR         top

       e2undo was written by Aneesh Kumar K.V.

AVAILABILITY         top

       e2undo is part of the e2fsprogs package and is available from

SEE ALSO         top

       mke2fs(8), tune2fs(8)

COLOPHON         top

       This page is part of the e2fsprogs (utilities for ext2/3/4
       filesystems) project.  Information about the project can be found at
       ⟨http://e2fsprogs.sourceforge.net/⟩.  It is not known how to report
       bugs for this man page; if you know, please send a mail to
       man-pages@man7.org.  This page was obtained from the project's
       upstream Git repository
       ⟨git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git⟩ on 2020-07-14.
       (At that time, the date of the most recent commit that was found in
       the repository was 2020-03-21.)  If you discover any rendering prob‐
       lems in this HTML version of the page, or you believe there is a bet‐
       ter or more up-to-date source for the page, or you have corrections
       or improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to man-pages@man7.org

E2fsprogs version 1.46-WIP       March 2020                        E2UNDO(8)