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E2UNDO
Section: Maintenance Commands (8) Updated: March 2025 Index
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NAME
e2undo - Replay an undo log for an ext2/ext3/ext4 file system
SYNOPSIS
e2undo
[
-f
]
[
-h
]
[
-n
]
[
-o
offset
]
[
-v
]
[
-z
undo_file
]
undo_log device
DESCRIPTION
e2undo
will replay the undo log
undo_log
for an ext2/ext3/ext4 file system found on
device.
This can be
used to undo a failed operation by an e2fsprogs program.
OPTIONS
- -f
-
Normally,
e2undo
will check the file system superblock to make sure the undo log matches
with the file system 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 mechanism.
- -h
-
Display a usage message.
- -n
-
Dr-run; do not actually write blocks back to the file system.
- -o offset
-
Specify the file system'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
e2und-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
e2undo
was written by Aneesh Kumar K.V. ( aneesh.kumar@linux.vnet.ibm.com)
AVAILABILITY
e2undo
is part of the e2fsprogs package and is available from
http://e2fsprogs.sourceforge.net.
SEE ALSO
mke2fs(8),
tune2fs(8)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- AUTHOR
-
- AVAILABILITY
-
- SEE ALSO
-
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