UTMPDUMP(1) System Administration UTMPDUMP(1)NAMEutmpdump - dump UTMP and WTMP files in raw format
SYNOPSISutmpdump [-frohV] [ filename ]
DESCRIPTIONutmpdump 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
Output appended data as the file grows.
Undump, write back edited login information into utmp or wtmp
-o, --output file
Write command output to file instead of standard output.
Display help text and exit.
Display version information and exit.
NOTESutmpdump 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.
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.
SEE ALSOlast(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-
util-linux July 2012 UTMPDUMP(1)