9.1.3 Files that control terminal logins
# name getty type status comments
console "/usr/etc/getty std.9600" sun on local secure
ttya "/usr/etc/getty std.9600" unknown off local unsecure
ttyb "/usr/etc/getty std.9600" unknown off remote unsecure
The file ttys is derived from ttytab by init, and should not be edited.
For Ultrix ttys is more like ttytab in SunOS 4.1.X, and there is no ttytab.
Should you modify ttytab you will need to interrupt init to get it to reread this file. This can be done with the kill command:
# kill -HUP 1
where the -HUP (or -1) option (hangup) interrupts, but doesn't kill init.