EXPLANATION
The doas(1) utility first appeared in OpenBSD 5.8, intended
as a lightweight drop-in replacement for sudo(1), which stopped being
included in the base system since OpenBSD 5.7. The sudo utility had a
large codebase, with lots of customizable bells and whistles. Most users
would never use the advanced features of sudo, so in an attempt to
minimise the attack surface and make a simpler tool,
Ted Unangst
wrote doas.
Despite being smaller and with fewer options, it still
aimed to retain the fine-grained control that people had come to expect
of utilities such as sudo, as
Ted Unangst
describes in his blog post: https://https.www.google.com.tedunangst.com/flak/post/doas
SOURCE
https://man.openbsd.org/doas.1