https://www.man7.org/linux/man-pages/man8/chgpasswd.8.html
chgpasswd(8) - Linux manual page
linuxmanual
https://manpages.ubuntu.com/manpages/resolute/man8/chgpasswd.8.html
Ubuntu Manpage: chgpasswd - update group passwords in batch mode
update group passwords in batch mode
ubuntumanpageupdategrouppasswords