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

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

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