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自动备份MYSQL数据库

#!/bin/sh
db_user="dbuser"
db_passwd="dbpass"
db_host="localhost"
# the directory for story your backup file.
backup_dir="/var/www/sqlbak"
# date format for backup file (dd-mm-yyyy)
time="$(date +"%d-%m-%Y")"
# mysql, mysqldump and some other bin's path
MYSQL="/usr/bin/mysql"
MYSQLDUMP="/usr/bin/mysqldump"
MKDIR="/bin/mkdir"
RM="/bin/rm"
MV="/bin/mv"
GZIP="/bin/gzip"
# check the directory for store backup is writeable
test ! -w $backup_dir && echo "Error: $backup_dir is un-writeable." && exit 0
# the directory for story the newest backup
test ! -d "$backup_dir/backup.0/" && $MKDIR "$backup_dir/backup.0/"
# get all databases
all_db="$($MYSQL -u $db_user -h $db_host -p$db_passwd -Bse 'show databases')"
for db in $all_db
do
$MYSQLDUMP -u $db_user -h $db_host -p$db_passwd $db | $GZIP -9 > "$backup_dir/backup.0/$time.$db.gz"
done
# delete the oldest backup
test -d "$backup_dir/backup.5/" && $RM -rf "$backup_dir/backup.5"
# rotate backup directory
for int in 4 3 2 1 0
do
if(test -d "$backup_dir"/backup."$int")
then
next_int=`expr $int + 1`
$MV "$backup_dir"/backup."$int" "$backup_dir"/backup."$next_int"
fi
done
exit 0;