括号和引号内的变量扩展

Question

在下面的脚本中，我似乎无法在第二个语句中使 $var1 展开。我试过$var1, ${var1},echo $var1和'$var1'。它在几组引号和括号内，我想这就是导致问题的原因。有任何想法吗？

#!/bin/bash

# Get the AutoScalingGroupName for the NameNode ASG
var1=$(aws cloudformation list-stack-resources --stack-name abc123 | jq '.StackResourceSummaries[] | select(.ResourceType=="AWS::AutoScaling::AutoScalingGroup")' | jq '.PhysicalResourceId' | tr -d '"' | grep nn); echo $var1

var2=$(aws autoscaling describe-auto-scaling-instances | jq -r '.AutoScalingInstances[] | select(.AutoScalingGroupName == "$var1") | select(.AvailabilityZone == "us-east-1a") .InstanceId'); echo $var2

Answer 1

单引号中的变量不展开。尝试这个...

var2=$(aws autoscaling describe-auto-scaling-instances | jq -r '.AutoScalingInstances[] | select(.AutoScalingGroupName == "'"$var1"'") | select(.AvailabilityZone == "us-east-1a") .InstanceId'); echo $var2