NAME¶
tty-clock - a terminal digital clock
SYNOPSIS¶
tty-clock [-iuvsScbtrahDBxn] [-C [0-7]] [-f
format] [-d delay] [-a nsdelay]
[-T tty]
DESCRIPTION¶
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.
COMMANDS¶
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.
OPTIONS¶
- -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.
EXAMPLES¶
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