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Full Discussion: Command line multiplications
Operating Systems Linux Command line multiplications Post 302912927 by Don Cragun on Tuesday 12th of August 2014 05:49:07 PM
Old 08-12-2014
I'm glad that you found something that works.

Assuming you are using a shell that accepts standard POSIX shell arithmetic expansions, and you want to wake up on the second (rather than just within a minute), or if you want intervals other than hours, you might also try:
Code:
#!/bin/ksh
round=${1:-3600}
sleep $((round -  (($(date +'%M * 60 + %S')) % round)))
date

By default, invoking this script without operands, it will sleep until the start of the next hour.

Invoking it with the operand 60, it will sleep until the start of the next minute.

And, invoking it with the operand 86400, it will sleep until midnight.
 

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LEARN ABOUT DEBIAN

wmcalclock

WMCALCLOCK(1)						      General Commands Manual						     WMCALCLOCK(1)

NAME

       WMCALCLOCK - Dockable Calendar Clock

SYNOPSIS

       wmCalClock  [-h] [-display <Display>] [-b <Volume>] [-e <Command>] [-24] [-s] [-S] [-L <Longitude>] [-l] [-tc <color>] [-bc <color>] [-tek-
       ton] [-comicsans] [-arial] [-luggerbug] [-jazz]

DESCRIPTION

       wmCalClock is a simple Calendar Clock with anti-aliased text and drop-shadows.

OPTIONS

       -h     Display list of command-line options.

       -display [display]
	      Use an alternate X Display.

       -b <Volume>
	      Beep on the hour with specified volume (between -100 and 100).

       -e <Command>
	      Command to execute via double click of mouse button 1. (Use quotes if your command has white space in it).

       -24    Show time in 24-hour format instead of default 12-hour AM/PM format.

       -30    Show local time in 30-hour format.  Times between midnight and 6 AM are displayed as belonging to the  previous  day,  so  the  hour
	      ranges from 6 to 29.

       -g     Show Greenwich Mean Time (GMT).

       -s     Show Greenwich Mean Sidereal Time (GMST) in 24-hour format.

       -S     Dont show seconds.

       -L <Longitude>
	      Show Local Sidereal Time (LST) in 24-hour format. Longitude is in degrees (- for West + for East).

       -l     Force use of lower color pixmap to conserve colors. On displays with <= 8 bits, the low color Pixmap will always be used.

       -tc <color>
	      Change color of time-field digits.

       -bc <color>
	      Change color of time-field background.

       -tekton
	      Use the Tekton font for time field.

       -arial Use the Arial (i.e. Helvetica)  font for time field.

       -jazz  Use the JazzPoster font for time field.

       -luggerbug
	      Use the LuggerBug font for time field.

       -comicsans
	      Use the ComicSans font for time field.

BUGS

       Who knows? (Let me know if you find any).

AUTHOR

       Michael G. Henderson <mghenderson@lanl.gov>

								 16 December 1998						     WMCALCLOCK(1)
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