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.\" Copyright 2020 Thomas E. Dickey                                          *
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.\" $Id: gdc.6,v 1.5 2020/02/02 23:34:34 tom Exp $
.TH GDC 6
.SH NAME
gdc \- grand digital clock (curses)
.SH SYNOPSIS
.B gdc \fP[\fIoptions\fP] [\fIn\fP]
.SH DESCRIPTION
.I Gdc
runs a digital clock made of reverse-video blanks on a terminal screen.
If the terminal supports color, the clock is drawn in red.
You can make the clock stop, pause or resume by pressing a ``q'',
``s'' or space, respectively.
.SH OPTIONS
.TP
.B \-d
use terminal's default colors for the background.
.TP
.B \-n
redirects input to /dev/null, making it ignore the stop/pause commands.
You can still stop it by pressing the interrupt key.
.TP
.B \-s
makes digits scroll as they change.
When running on a fast display, the program breaks up the scrolling into
subsecond repaints, making the operation appear smooth.
.TP
.B \-t \fIhh:mm:ss\fP
specify starting time (default is ``now'').
.PP
With an optional numeric argument
.I num
it stops after
.I num
seconds.
Normally it runs "forever" (counting down from 2 billion seconds).
.SH AUTHOR
Amos Shapir, modified for curses by John Lupien.
.br
Improvements for ncurses by Thomas Dickey.