Assign output to variable in Bash

BashCurl

Bash Problem Overview

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

However, when I run the script the following happens:

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

How can I get the output into $IP correctly?

Bash Solutions

Solution 1 - Bash

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

Solution 2 - Bash

Same with something more complex...getting the ec2 instance region from within the instance.

INSTANCE_REGION=$(curl -s 'http://169.254.169.254/latest/dynamic/instance-identity/document' | python -c "import sys, json; print json.load(sys.stdin)['region']")

echo $INSTANCE_REGION
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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionAlex BliskovskyView Question on Stackoverflow
Solution 1 - BashghotiView Answer on Stackoverflow
Solution 2 - BashKostas DemirisView Answer on Stackoverflow