UTMPDUMP(1) User Commands UTMPDUMP(1) (NAME) utmpdump - utmp wtmp (SYNOPSIS) utmpdump [options] filename (DESCRIPTION) utmpdump UTMP WTMP . utmpdump (stdin) filename . (OPTIONS) -f, --follow . -o, --output file file . -r, --reverse (Undump) utmp wtmp. -h, --help . -V, --version . (NOTES) utmpdump utmp wtmp . utmp/wtmp ASCII : utmpdump -r < ascii_file > wtmp utmpdump . (File formats) utmp(5) . . 2.28 ctime(3) . ISO-8601 UTC-0 . . (BUGS) -r utmp/wtmp . . (AUTHORS) Michael Krapp (SEE ALSO) last(1), w(1), who(1), utmp(5) (REPORTING BUGS) . (AVAILABILITY) utmpdump util-linux . util-linux 2.42.3 2026-09-02 UTMPDUMP(1)