在bash脚本中输入MySQL密码

I have a bash script that needs to perform a couple actions in MySQL. So far I have something like this:

我有一个bash脚本，需要在MySQL中执行一些操作。到目前为止，我有这样的事情：

#!/bin/sh
read -p "Enter your MySQL username: " $sqluname
read -sp "Enter your MySQL password (ENTER for none): " $sqlpasswd
/usr/bin/mysql -u $sqluname -p $sqlpasswd << eof
*some SQL stuff*
eof

This works well until it's used with a MySQL username that has a blank password. The user hits ENTER at my password prompt, but then they receive another prompt to "Enter your password" again from MySQL.

这很有效，直到它与具有空密码的MySQL用户名一起使用。用户在我的密码提示符处按Enter键，但随后他们再次收到来自MySQL的“输入密码”的提示。

How can I avoid this second password prompt and make the script deal with both blank and non-blank passwords?

如何避免此第二个密码提示并使脚本处理空白和非空密码？

2 个解决方案

#1

Check if the password is blank or not, and if it is, then omit the -p switch altogether.

检查密码是否为空，如果是，则完全省略-p开关。

read -p "Enter your MySQL username: " $sqluname
read -sp "Enter your MySQL password (ENTER for none): " $sqlpasswd
if [ -n "$sqlpasswd" ]; then
  /usr/bin/mysql -u $sqluname -p $sqlpasswd << eof
else
  /usr/bin/mysql -u $sqluname << eof
fi

Later edit to avoid a whole if-then-else block:

稍后编辑以避免整个if-then-else块：

command="/usr/bin/mysql -u $sqluname"
[ -n "$sqlpasswd" ] && command="$command -p$sqlpasswd"
eval $command

#2

You'd need to specify the -n switch if $sqlpasswd is empty (instead of -p $sqlpasswd).

如果$ sqlpasswd为空（而不是-p $ sqlpasswd），则需要指定-n开关。

#1