UTMPDUMPSection: User Commands (1)
Updated: July 2014
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NAMEutmpdump - dump UTMP and WTMP files in raw format
SYNOPSISutmpdump [options] [filename]
DESCRIPTIONutmpdump 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.
- -V, --version
- Display version information and exit.
- -h, --help
- Display help text and exit.
NOTESutmpdump 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
BUGSYou 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.
SEE ALSOlast(1), w(1), who(1), utmp(5)
AVAILABILITYThe utmpdump command is part of the util-linux package and is available from Linux Kernel Archive
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