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

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

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 filesys-
       tem found on device.  This can be used to undo a	failed operation by an
       e2fsprogs program.

OPTIONS
       -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 mechanism.

       -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
       e2undo	 was	written	   by	 Aneesh	   Kumar    K.V.   (aneesh.ku-
       mar@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)

E2fsprogs version 1.45.6	  March	2020			     E2UNDO(8)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | AUTHOR | AVAILABILITY | SEE ALSO

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