utmpdump - dump UTMP and WTMP files in raw format
utmpdump [-froh] filename
utmpdump is a simple program to dump UTMP and WTMP files in raw format,
so they can be examined.
- -f
- output appended data as the file grows.
- -r
- reverse. Write back edited login information into utmp or wtmp files.
- -o
- use old libc5 format.
- -h
- usage information.
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.
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.
last(1), w(1), who(1), utmp(5),