Now
MAIN commitmail json YAML
stty & gtty were around since v1
https://www.bell-labs.com/usr/dmr/www/man21.pdf
https://www.bell-labs.com/usr/dmr/www/man22.pdf
https://www.bell-labs.com/usr/dmr/www/man21.pdf
https://www.bell-labs.com/usr/dmr/www/man22.pdf