Problem with my crontab file, using mysqldump Post: 302403116

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Top Forums UNIX for Dummies Questions & Answers Problem with my crontab file, using mysqldump Post 302403116 by Ultrix on Thursday 11th of March 2010 12:49:14 PM

03-11-2010

Registered User

Problem with my crontab file, using mysqldump

My crontab file tells cron to run a certain shell script at 10:30 AM every day. The shell script backs up my database with mysqldump and then runs a sed script that does some editing of the backup file.

I have programmed the shell script to write an error message to a file I have in my home directory, ~/errorlog.txt, whenever it can't locate the backups directory. I looked in my errorlog file today and found the following messages:

Code:

Tue Mar  9 10:30:00 EST 2010: Error in mysqldump script: can not find backups directory
Thu Mar 11 10:30:00 EST 2010: Error in mysqldump script: can not find backups directory

Here is the script I used:

Code:

#!/bin/bash

olddir=$PWD;
gotomysql > /dev/null;
# alias
if [ -e backups ]
then
    sudo mysqldump Personal > backups/personal.mysql;
    # Lines 24 through 31 are for editing personal.mysql
    if [ -e ~/Desktop/Computer_Stuff/sed_scripts/edit_backup.sed ]
    then
         sed -f ~/Desktop/Computer_Stuff/sed_scripts/edit_backup.sed backups/personal.mysql > temppersonal.mysql;
        cat temppersonal.mysql > backups/personal.mysql;
        rm temppersonal.mysql;
    else echo "$(date): Error in mysqldump script: can not find edit_backup.sed" >> ~/errorlog.txt;
    fi
else echo "$(date): Error in mysqldump script: can not find backups directory" >> errorlog.txt;
fi
cd $olddir;
unset olddir;

The content of the script is not important. I just put it there so you can see what I'm doing. You can skip over it if you don't want to read my sloppy code.

I think I have determined the problem: cron can only run programs when the computer is on and running. When it's asleep, certain things don't work. Obviously, there is no problem with the script, as it appears to have worked on the 10th. I think this is because I was using my computer at the time.

Do you think I diagnosed the problem correctly? Also, is there any way of working around the fact that I can't have my computer active 24/7?

Ultrix

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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)