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Man Pages
TTY-CLOCK(1) User Commands TTY-CLOCK(1)

tty-clock - a terminal digital clock

tty-clock [-iuvsScbtrahDBxn] [-C [0-7]] [-f format] [-d delay] [-a nsdelay] [-T tty]

tty-clock displays a simple digital clock on the terminal. Invoked without options it will display the clock on the upper left corner of the screen on the terminal it was executed from.

tty-clock accepts a number of runtime keyboard commands, upper and lower case characters are treated identically.
K,J,H,L
vi-style movement commands to set the position of the displayed clock. These commands have no effect when the centered option is set.
[0-7]
Select a different color for displaying the clock.
B
Toggles bewteen bold and normal colors.
X
Toggles displaying a box around the clock. This option is disabled by default.
C
Toggle the clock's position to centered. When set the movement commands are disabled.
R
Set the clock to rebound along the edges of the terminal.
S
Display seconds.
T
Switch time output to the 12-hour format.
Q
Quit.

-s
Show seconds.
-S
Screensaver mode. tty-clock terminates when any key is pressed.
-x
Show box.
-c
Set the clock at the center of the terminal.
-C [0-7]
Set the clock color.
-b
Use bold colors.
-t
Set the hour in 12h format.
-u
Use UTC time.
-T tty
Display the clock on the given tty. tty must be a valid character device to which the user has rw access permissions. (See EXAMPLES)
-r
Do rebound the clock.
-f format
Set the date format as described in strftime(3).
-n
Do not quit the program when the Q key is pressed (or when any key is pressed while in Screensaver mode). A signal must be sent to tty-clock in order to terminate its execution. (See EXAMPLES)
-v
Show tty-clock version.
-i
Show some info about tty-clock.
-h
Show usage information.
-D
Hide the date.
-B
Enable blinking colon.
-d delay
Set the delay (in seconds) between two redraws of the clock. Default 1s.
-a nsdelay
Additional delay (in nanoseconds) between two redraws of the clock. Default 0ns.

To invoke tty-clock in screensaver mode with the clock display set to rebound and the update delay set to 1/10th of a second (10 FPS):
$ tty-clock -Sra 100000000 -d 0

The following example arranges for tty-clock to be displayed indefinitely on one of the Virtual Terminals on a Linux system at boot time using an inittab(5) entry:

# /etc/inittab:
9:2345:respawn:/usr/bin/tty-clock -c -n -T /dev/tty9
October 2013

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