# !/bin/sh
db=$1
pw=$2
bakdir=/dat/bak/db
file=$bakdir/${db}_`date +"%Y%m%d"`.sqlbak
mysqldump --lock-tables --user root -p"$pw"  $db > $file

find $bakdir -size 0 -exec rm {} \;
ls -1tr $bakdir/${db}_* | head -n -5 | xargs -d '\n' rm -f --  
#find /dat/bak/db -name "${db}_*" -mtime +5 -exec rm {} \;