utmpdump <root
UTMPDUMP(1)                               User Commands                               UTMPDUMP(1)

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.

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

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 reinte‐
       grated using:

              utmpdump -r < ascii_file > wtmp

       But be warned, utmpdump was written for debugging purposes only.

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.

AUTHOR
       Michael Krapp

SEE ALSO
       last(1), w(1), who(1), utmp(5)

AVAILABILITY
       The  utmpdump command is part of the util-linux package and is available from Linux Kernel
       Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util-linux/⟩.

util-linux                                  July 2014                                 UTMPDUMP(1)

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