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+//po4a: entry man manual
+////
+Copyright (C) 2010 Michael Krapp
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+////
+= utmpdump(1)
+:doctype: manpage
+:man manual: User Commands
+:man source: util-linux {release-version}
+:page-layout: base
+:command: utmpdump
+
+== NAME
+
+utmpdump - dump UTMP and WTMP files in raw format
+
+== SYNOPSIS
+
+*utmpdump* [options] _filename_
+
+== DESCRIPTION
+
+*utmpdump* is a simple program to dump UTMP and WTMP files in raw format, so they can be examined. *utmpdump* reads from stdin unless a _filename_ is passed.
+
+== OPTIONS
+
+*-f*, *--follow*::
+Output appended data as the file grows.
+
+*-o*, *--output* _file_::
+Write command output to _file_ instead of standard output.
+
+*-r*, *--reverse*::
+Undump, write back edited login information into the utmp or wtmp files.
+
+include::man-common/help-version.adoc[]
+
+== NOTES
+
+*utmpdump* can be useful in cases of corrupted utmp or wtmp entries. It can dump out utmp/wtmp to an ASCII file, which can then be edited to remove bogus entries, and reintegrated using:
+
+____
+*utmpdump -r < ascii_file > wtmp*
+____
+
+But be warned, *utmpdump* was written for debugging purposes only.
+
+=== File formats
+
+Only the binary version of the *utmp*(5) is standardised. Textual dumps may become incompatible in future.
+
+The version 2.28 was the last one that printed text output using *ctime*(3) timestamp format. Newer dumps use millisecond precision ISO-8601 timestamp format in UTC-0 timezone. Conversion from former timestamp format can be made to binary, although attempt to do so can lead the timestamps to drift amount of timezone offset.
+
+== BUGS
+
+You may *not* use the *-r* option, as the format for the utmp/wtmp files strongly depends on the input format. This tool was *not* written for normal use, but for debugging only.
+
+== AUTHORS
+
+Michael Krapp
+
+== SEE ALSO
+
+*last*(1),
+*w*(1),
+*who*(1),
+*utmp*(5)
+
+include::man-common/bugreports.adoc[]
+
+include::man-common/footer.adoc[]
+
+ifdef::translation[]
+include::man-common/translation.adoc[]
+endif::[]