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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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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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