我从脚本用户获取变量的名称作为第一个参数,并将所述变量的值回显给控制台：
#!/bin/bash
variablename=$1
echo "The value of $variablename is: " ${!variablename}
这很棒！
我无法工作的是,如果我想将该变量更改为用户的第二个参数的值.语法错误的示例是：
#!/bin/bash
variablename=$1
echo "The value of $variablename is: " ${!variablename}
echo "I will now try to change the value into $2."
(!variablename}=$2
# The above line generates: {!variablename}=2: command not found
在请求帮助后几分钟我突然闪过,我想我有一个解决方案：
#!/bin/bash
variablename=$1
echo "The value of $variablename is: " ${!variablename}
echo "I will now try to change the value into $2."
eval "$variablename=$2"
echo "Success! $variablename now has the value ${!variablename}!"
有用.有没有更好的办法？
