将输出分配给Bash中的变量 [英] Assign output to variable in Bash

问题描述

我正在尝试将cURL的输出分配给这样的变量:

I'm trying to assign the output of cURL into a variable like so:

#!/bin/sh
$IP=`curl automation.whatismyip.com/n09230945.asp`
echo $IP
sed s/IP/$IP/ nsupdate.txt | nsupdate

但是，当我运行脚本时，会发生以下情况:

However, when I run the script the following happens:

./update.sh: 3: =[my ip address]: not found

如何将输出正确地输入到$IP?

How can I get the output into $IP correctly?

推荐答案

在shell中，您不必在要分配的变量前放置$.仅在引用变量时使用$ IP.

In shell, you don't put a $ in front of a variable you're assigning. You only use $IP when you're referring to the variable.

#!/bin/bash

IP=$(curl automation.whatismyip.com/n09230945.asp)

echo "$IP"

sed "s/IP/$IP/" nsupdate.txt | nsupdate

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