9.8. - zq don't write text to screen
stops C-PLOT from echoing to the screen the characters you type at the keyboard, and it stops the program from printing any messages on the screen for as long the filter is open.
zqThe
zq, or quiet-mode, command is useful with some filter programs
that use the terminal as their display device.
The command prevents
C-PLOT messages from becoming interspersed with
graphics commands sent by the filter process or, if applicable, it
prevents the filter display from being overlaid with messages generated
by C-PLOT.
In quiet mode, your terminal will not echo the characters you type at the keyboard. C-PLOT will not print messages on the screen; only the output of graphics filters will be displayed. The quiet-mode state is passed to user functions (see
fn), and
you can arrange for them not to write to the screen when quiet mode
is on.
However, output from a subshell (see
u) will be written
to the screen.
If the filter is being kept open with the
zw command, once quiet
mode is turned on, it will stay on until the filter is closed with
the
zx or
zs commands, another filter is initialized with
the
zi command, you interrupt a command with
^C or you
exit the plot program.
Quiet mode is usually necessary with filters such as 4010 and 4014. Quiet mode is not enforced when plotting on the pen plotter.