通过shell脚本实现MySQL备份并恢复，for in流程控制

从3306备份数据库，还原到3307数据库上，通过shell脚本的for in流程控制实现

#!/bin/bash

my_date=`date +%Y%m%d`

my_time=`date +%H%M`

my_date_yesterday=`date +%Y%m%d --date=‘1 days ago‘`

echo "----------------------------------------------------"

echo "$my_date $my_time"

backup_dir="/data/backup3307/${my_date}"

mkdir -p ${backup_dir}

echo "db backup dir: ${backup_dir}"

DBS="data1 data2 data3 data4 "

for db in ${DBS}

do

echo "${db} backup start..."

echo "$my_date $my_time"

file="${backup_dir}/${db}_${my_date}.sql"

mysqldump --login-path=backup --single-transaction --set-gtid-purged=OFF --opt --triggers --routines --events ${db} > ${file}

size=`ls -lh ${file}|awk ‘{print $5}‘`

echo "size: ${size}"

echo "${db} backup end. "

echo "$my_date $my_time"

echo "${db} restore start..."

mysql --login-path=restore -e "CREATE DATABASE ${db}_$my_date_yesterday DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;"

mysql --login-path=restore "${db}_$my_date_yesterday" < ${file}

echo "${db} restore end."

echo "$my_date $my_time"

echo "gzip ${file}"

gzip ${file}

done

# delete old backup data

old_date=`date +%Y%m%d -d ‘5 days ago‘`

rm -rf /data/backup3307/${old_date}

for in循环举例：

#!/bin/sh

s="a b c "

for i in $s

do

echo "i is $i"

done

执行结果：

# ./for_in.sh

i is a

i is b

i is c