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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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sttime(3)						    ShapeTools Toolkit Library							 sttime(3)

NAME
stMktime, stWriteTime - date and time handling SYNOPSIS
#include <config.h> #include <sttk.h.h> time_tstMktime (char *string); char*stWriteTime (time_t date); DESCRIPTION
stMktime scans the given string and tries to read a date and time from it. It understands various formats of date strings. The following is a list of all valid formats, optional parts in brackets. [Tue] Jan 5[,] [19]93 This includes the standard asctime(3) format. Jan 5 With no year given, the year defaults to the current year. [19]93/01/05 This notation requires month and day represented by exactly two digits. 5.1.[19]93 This is the usual German notation. 5.1. German notation referencing the current year. A certain time, given together with the date must always have the following form. hours:minutes[:seconds] Each of the fields must be an integer value within the proper range (hours: 0-23, minutes and seconds: 0-59). Values below 10 may be written as one digit numbers. The time value may be placed anywhere in the date string: at the beginning, at the end, or somewhere in the middle. Any amount of white- space may be given between a field of the time value and the separating colon. The time is always considered to be local time. stWriteTime generates a time string similar to asctime(3) from its date argument. SEE ALSO
asctime(3) BUGS
Time Zone Names within the time string (like `MET') are not handled properly. In most cases they will cause a failure. sttk-1.7 Thu Jun 24 17:43:35 1993 sttime(3)
All times are GMT -4. The time now is 10:01 PM.
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