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UTMPDUMP(1) - phpMan

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UTMPDUMP(1)                           System Administration                           UTMPDUMP(1)

       utmpdump - dump UTMP and WTMP files in raw format

       utmpdump [options] [filename]

       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.

       -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.

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

       -V, --version
              Display 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, 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.

       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.

       Michael Krapp

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

       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 2012                                 UTMPDUMP(1)

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