DBA Tips Archive for Oracle

  


Crontab Redirect to Log File With Date in Name

by Jeff Hunter, Sr. Database Administrator


Contents

  1. Overview
  2. Solution


Overview

The following article should serve as a note on how to include a date string (using the UNIX date command) to a file within a crontab file.

You may have run into this before. You attempt to insert the current date/time to a file within the crontab as follows:

30 12 * * * /u01/app/oracle/bin/rman_backup.pl > /u01/app/oracle/log/rman_backup_`date '+%Y%M%d'`.log 2>&1
You then receive an email from cron with the following error:

/u01/app/oracle/log/rman_backup_`date '

/bin/sh: -c: line 1: unexpected EOF while looking for matching ``'
/bin/sh: -c: line 2: syntax error: unexpected end of file

Ok, so you try to escape the % with \ and try it again. Well, I didn't get an error, but the log file now includes the newly included escape character \:

    rman_backup_\2004\11\28.log
Even trying to use two escape characters does not do the trick. You will get an error similar to the first by with +\\ at the end of the message.

One solution is to simply use the date command without any formatting, but this is not what most users are looking for when you want a standard convention (standard date format like YYYYMMDD) for log files.

Read on for one possible solution...

Solution
The solution that has always worked for me no matter what SHELL I am using or the flavor of UNIX:
30 12 * * * /u01/app/oracle/bin/rman_backup.pl > /u01/app/oracle/log/rman_backup_$(date +\%Y\%m\%d_\%H:\%M:\%S\%z).log 2>&1
If you need only the date (not including the time element):
30 12 * * * /u01/app/oracle/bin/rman_backup.pl > /u01/app/oracle/log/rman_backup_$(date +\%Y\%m\%d).log 2>&1


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Last modified on
Friday, 22-Feb-2008 18:18:01 EST
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