CentOS 7.0 - man page for utmpdump (centos section 1)
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UTMPDUMP(1) System Administration UTMPDUMP(1)
utmpdump - dump UTMP and WTMP files in raw format
utmpdump [-frh] [ filename ]
utmpdump is a simple program to dump UTMP and WTMP files in raw format, so they can be
examined. utmpdump eads from stdin unless a filename is passed.
Output appended data as the file grows.
Undump, write back edited login information into utmp or wtmp files.
Print a help text and exit.
Output version information and exit.
utmpdump can be useful in cases of corrupted utmp or wtmp entries. It can dump out
utmp/wtmp to an ASCII file, then that file can be edited to remove bogus entries and rein-
utmpdump -r < ascii_file > wtmp
but be warned as utmpdump was written for debugging purpose only.
You may not use the option -r 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.
last(1), w(1), who(1), utmp(5)
The utmpdump command is part of the util-linux package and is available from Linux Kernel
util-linux July 2012 UTMPDUMP(1)
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