utmpdump(1) [centos man page]

UTMPDUMP(1)						       System Administration						       UTMPDUMP(1)

NAME

       utmpdump - dump UTMP and WTMP files in raw format

SYNOPSIS

       utmpdump [-frh] [ filename ]

DESCRIPTION

       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 file-
       name is passed.

OPTIONS

       -f, --follow
	      Output appended data as the file grows.

       -r, --reverse
	      Undump, write back edited login information into utmp or wtmp files.

       -h, --help
	      Print a help text and exit.

       -V, --version
	      Output version information 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,  then  that  file  can	be
       edited to remove bogus entries and reintegrated, using

	      utmpdump -r < ascii_file > wtmp

       but be warned as utmpdump was written for debugging purpose only.

BUGS

       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.

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 2012							       UTMPDUMP(1)

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 file-
       name 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 reintegrated using:

              utmpdump -r < ascii_file > wtmp

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

   File formats
       The only 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.

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  <https://www.kernel.org/pub/linux/utils
       /util-linux/>.

util-linux                                                           July 2014                                                         UTMPDUMP(1)