Now
MAIN commitmail json YAML
utmp(5) was present in v1
https://www.bell-labs.com/usr/dmr/www/man51.pdf
Earliest version of wtmp I could find was in v3
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man5/wtmp.5
https://www.bell-labs.com/usr/dmr/www/man51.pdf
Earliest version of wtmp I could find was in v3
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man5/wtmp.5