crontab entry Post: 302292061

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Operating Systems AIX crontab entry Post 302292061 by bakunin on Thursday 26th of February 2009 07:55:15 PM

02-26-2009

Registered User

Create a crontab entry to run the script the first seven days of every month. This is straightforward. Within the script test for the day of week being Saturday or Sunday and stop if this test returns <true>.

This will work generally, the only exception being floating holydays.

To cover even this you will have to provide a list of holydays to the script and put it in crontab so that it is called daily. The script would first test if a new month has begun. If this is the case and the day of week is not a Saturday or Sunday or the date is found in the holyday list (in which case it aborts), it runs and increments a counter in a file until 5 is reached. If a new month has not begun the file with the counter is read and if the counter is already at 5 the script stops also.

In pseudo-code:

Code:

if( new month has begun since last run )
     clear counter-file

if( DOW is Saturday or Sunday or day is in holyday-list ) {
     abort
} else {
     if( counter file is less then 5 ) {
          do_work()
          increment counter file
     } else {
          abort
     }
}

I hope this helps.

bakunin

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KEP_RELOAD(1)						      General Commands Manual						     KEP_RELOAD(1)

NAME

       kep_reload - Update Predict's Keplerian elements

SYNOPSIS

	kep_reload

DESCRIPTION

       KEP_RELOAD is a simple utility that forces an immediate reload of PREDICT's Keplerian database through a socket connection while PREDICT is
       running in server mode.	It is especially useful in environments where PREDICT runs continuously, and periodic  Keplerian  element  updates
       are made outside of PREDICT, such as through scripts run through a crontab.

       The  "kepupdate"  script  found	in this directory is an example of a Keplerian element update script that can be run on an automated basis
       through a crontab.  It is designed to be placed in your home directory under a subdirectory  called  "cronjobs".   It  downloads  Keplerian
       orbital	data  from  www.celestrak.com  using  the  HTTP  protocol.   (The  "wget" utility, available from the Free Software Foundation, is
       required, and is included in many Linux distrubutions.)

       Type crontab -e to edit your crontab.  Simply add the following entry:

	       0 8 * * * kepupdate

       and your orbital database will update each morning at 8:00 AM (provided you have a network connection at that time).

       See the crontab man page for more information on editing your crontab.

AUTHOR

       This man page was written by A. Maitland Bottoms, AA4HS, for Debian GNU/Linux.

								  31 August 2003						     KEP_RELOAD(1)

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