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#!/bin/sh

PASS=$1

for i in `/usr/bin/mysql --user=root --password=$PASS --batch --skip-column-names -e "show databases" | sed 's/ /%/g'`;do
nice -n 19 /usr/bin/mysqldump -u root -p$PASS "$i" > /home/backupsql/"$i".sql
gzip /home/backupsql/"$i".sql
done

This will dump all databases into separate files, then gzip them. Perfect script for using in a backuppc DumpPreUserCmd option.