Shell 自动备份 MySQL 的脚本

#!/bin/sh 
# mysql_backup.sh: backup mysql databases and keep newest 5 days backup. 
# 
# db_user is mysql username 
# db_passwd is mysql password 
# db_host is mysql host 
# —————————– 
db_user="root"
db_passwd=""
db_host="localhost"
     
# the directory for story your backup file. 
backup_dir="/home/zhozdbbackup"
     
# 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;