平常执行sql，需要登录到mysql的shell下，然后再执行。比如：

$ /usr/bin/mysql -u root
mysql> select * from users;

但是如果写一点简单的脚本，也可以在命令行下直接运行sql并显示结果，比如：

$ cat executemysql.sh
#!/bin/sh

qry=$1;

echo "Executing the following query"
echo "$qry"

mysql -u root << eof
$qry
eof

运行一下:

$ ./executemysql.sh "select id,name,age from test.users limit 2"
Executing the following query
select id,name,age from test.users limit 2
id name age
3 john 20
4 tom 21

原文：Execute mysql from bash script