Need Help in constructing a script

rajesh.bahl · 06-05-2009, 05:24 AM

Am using postfix running on CentOS 5.3. It has the "always_bcc" function enabled for backup of the mails. The "mailbox_size_limit" is set to 1GB.

When this limit for "backup" is reached, the system starts giving error and we transfer the contents of this "backup file" which is /var/spool/mail/backup to some other file and make this as an empty file to start over again.

I need to automate the whole process in the sense that the system should check for the size of /var/spool/mail/backup file every one hour and when the size reaches to 1GB, it should execute the commands as:

service postfix stop
cp /var/spool/mail/backup /home/backup/<some_name>
> /var/spool/mail/backup
service postfix start

I am not having much idea about shell scripting - Can any one help in constructing such a script ?

thanking in advance
rajesh.bahl

tsg · 06-05-2009, 02:32 PM

Here's part of a script I wrote for rotating and compressing logs based on a file size limit. It might give you a good starting point.

Code:

#!/bin/bash

SIZELIMIT=1000000000

FILESIZE=`stat -c%s $x`;
if [[ $FILESIZE -gt $SIZELIMIT ]]; then
	# stop the service, backup the log, restart the service
fi