03-01-2018
First off, it is good that you are trying to use the crontab command to alter the file.
However, I get the idea that you have lots of redundant lines in your crontab file. Otherwise you would not bother with a script like this.
Correct me if I'm wrong, but otherwise you should simply use the crontab without pipes and sed. Just a single one line entry pointing to the shell script. Let it do all of checking testing and renaming. You can safely use most text tools on the script - you cannot do that with crontab files necessarily.
If I'm correct you should copy all of that crud out of crontab and place it in a single larger shell script where you won't have problems like the one one you have now. crontab is a special kind of file and it is easy to mess it up and get lots of errors generated into many email messages, for example.
Do not rename the crontab file.
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LEARN ABOUT DEBIAN
kep_reload
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)