ttyflags sets the device-specific flags for terminals using
TIOCSFLAGS, based on the flags found on the terminal's line in
/etc/ttys.
The options are as follows:
-a
Set the flags for all terminals in /etc/ttys.
-v
Be verbose about what the terminals' flags will be set to.
The
tty arguments are optional, but must not be specified if the
-a flag is used. If specified, the
tty arguments should be the base names of the ttys, as found in
/etc/ttys.