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Full Discussion: Ending script at specific time.
Top Forums Shell Programming and Scripting Ending script at specific time. Post 302416764 by deindorfer on Tuesday 27th of April 2010 04:30:50 PM
Old 04-27-2010
Perl Epoch Time
Code:
perl -e 'print time'

/bin/date +%s

Those two are more concise, and accomplish the same thing ( return the seconds since the epoch 00:00:00 Jan 1, 1970 GMT, not counting leap seconds ).

The date command is GNU date 7.2 on Linux. Use Perl, if you are worried about portability of /bin/date

Here is a simple example of a perl script to do what you want:

Code:
my $begin_time = time;
my $offset = 10; # number of seconds
do { 
  print "foo\n"; 
  sleep 1; 
} while ( time < ($begin_time + $offset) );

this grabs the current epoch time and then executes the code in the do() block ( in this case, prints "foo" once every second ). It keeps doing this for 10 seconds total.

What you need to do is put the start time in as a field in your crontab which runs this job, and then calculate the offset in seconds from that time.

In the example you gave this is 60 seconds * 60 minutes * 15 hrs, or 54,000 seconds. that is what you should set $offset to.

I would actually set it, not "54,000" but the equation, as it helps you to see what is going on:

Code:
my $offsest = 60 * 60 * 15;  # easier to understand this is 15 hours

Hope that Helps
Last edited by deindorfer; 04-27-2010 at 05:54 PM..
 

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LEARN ABOUT OPENDARWIN

tcl_gettime

Tcl_GetTime(3)						      Tcl Library Procedures						    Tcl_GetTime(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_GetTime - get date and time

SYNOPSIS

       #include <tcl.h>

       Tcl_GetTime( timePtr )

ARGUMENTS

       Tcl_Time *   timePtr   (out)	Points to memory in which to store the date and time information.
_________________________________________________________________

DESCRIPTION

       The  Tcl_GetTime function retrieves the current time as a Tcl_Time structure in memory the caller provides.  This structure has the follow-
       ing definition:
	      typedef struct Tcl_Time {
		  long sec;
		  long usec;
	      } Tcl_Time;

       On return, the sec member of the structure is filled in with the number of seconds that have elapsed since the  epoch:  the  epoch  is  the
       point  in time of 00:00 UTC, 1 January 1970.  This number does not count leap seconds - an interval of one day advances it by 86400 seconds
       regardless of whether a leap second has been inserted.

       The usec member of the structure is filled in with the number of microseconds that have elapsed since the start of the second designated by
       sec.  The Tcl library makes every effort to keep this number as precise as possible, subject to the limitations of the computer system.	On
       multiprocessor variants of Windows, this number may be limited to the 10- or 20-ms granularity of the system clock.   (On  single-processor
       Windows systems, the usec field is derived from a performance counter and is highly precise.)

SEE ALSO

       clock

KEYWORDS

       date, time

Tcl									8.4							    Tcl_GetTime(3)
All times are GMT -4. The time now is 03:42 PM.
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