shell 读取文本并访问mysql/redis

#!/bin/bash
File="redeemcode.csv"
#File=$1

database="d_redeem_info"

echo "check redeemcode state begin..."

while read line
do
if [ -z "$line" ];then
 echo "is null"
else
 #rlt=`mysql -D $database -h127.0.0.1 -uroot -proot -e "select * from  t_redeem_code where c_redeem_code = '${line%?}';" `
 rlt=$(mysql -D $database -h127.0.0.1 -uroot -proot -e "select * from  t_redeem_code where c_redeem_code = '${line%?}';" )
 cham=`redis-cli -h 192.168.1.6 -p 6380 hset guild_info:${arr[0]} activity_contribution  ${arr[1]}`
fi

done < ${File}

echo "check redeemcode state end..."

shell传参：$0 为执行的文件名，$n，n代表第几个参数

读文件：

while read line
do
  echo $line
done < ${File}

逻辑判断：

if [ -z "$line" ];then
 echo "is null"
else
 echo "not null"
fi

shell去掉最后一个字符：

${line%?}

接收mysql操作返回值：

rlt='mysql -h ......'
rlt=$(mysql -h ......)