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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crontab

CRONTAB(1)						      General Commands Manual							CRONTAB(1)

NAME

       crontab - maintain crontab files for individual users (V3)

SYNOPSIS

       crontab [ -u user ] file
       crontab [ -u user ] { -l | -r | -e }

DESCRIPTION

       Crontab	is  the  program used to install, deinstall or list the tables used to drive the cron(8) daemon in Vixie Cron.	Each user can have
       their own crontab, and though these are files in /var, they are not intended to be edited directly.

       If the allow file exists, then you must be listed therein in order to be allowed to use this command.  If the allow file does not exist but
       the  deny  file	does  exist, then you must not be listed in the deny file in order to use this command.  If neither of these files exists,
       then depending on site-dependent configuration parameters, only the super user will be allowed to use this command, or all  users  will	be
       able to use this command.

       If the -u option is given, it specifies the name of the user whose crontab is to be tweaked.  If this option is not given, crontab examines
       "your" crontab, i.e., the crontab of the person executing the command.  Note that su(8) can confuse crontab and that  if  you  are  running
       inside of su(8) you should always use the -u option for safety's sake.

       The  first  form  of  this  command is used to install a new crontab from some named file or standard input if the pseudo-filename ``-'' is
       given.

       The -l option causes the current crontab to be displayed on standard output.

       The -r option causes the current crontab to be removed.

       The -e option is used to edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables.  After you exit
       from the editor, the modified crontab will be installed automatically.

SEE ALSO

       crontab(5), cron(8)

FILES

       /etc/cron.allow
       /etc/cron.deny

STANDARDS

       The  crontab command conforms to IEEE Std1003.2-1992 (``POSIX'').  This new command syntax differs from previous versions of Vixie Cron, as
       well as from the classic SVR3 syntax.

DIAGNOSTICS

       A fairly informative usage message appears if you run it with a bad command line.

AUTHOR

       Paul Vixie <paul@vix.com>

4th Berkeley Distribution					 29 December 1993							CRONTAB(1)