CODEWITHSUNDEEP
shellsh
Jaishree Mishra
Jaishree Mishra

Reputation: 545

Shell script syntax, escape character

I have a shell script as given below. This script actually add AWS instance in autoscalling scale in protection group. When I run individual commands that went fine. But when I created a shell file and tried to execute same there are error. See below script

set -x
INSTANCE_ID=$(wget -q -O - http://169.254.169.254/latest/meta-data/instance-id)
ASG_NAME=$(aws ec2 describe-tags --filters "Name=resource-id,Values=$INSTANCE_ID"  --region us-east-2 | jq '.Tags[] | select(.["Key"] | contains("a:autoscaling:groupName")) | .Value')
ASG_NAME=$(echo $ASG_NAME | tr -d '"')
aws autoscaling set-instance-protection --instance-ids $INSTANCE_ID --auto-scaling-group-name $ASG_NAME  --protected-from-scale-in --region us-east-2

error is as given below. I think issue is with second line. It is not able to get ASG_NAME, I tried some of escape character but nothing is working.

+++ wget -q -O - http://169.254.169.254/latest/meta-data/instance-id
++ INSTANCE_ID=i-----
+++ aws ec2 describe-tags --filters Name=resource-id,Values=i------ --region us-east-2
+++ jq '.Tags[] | select(.["Key"] | contains("a:autoscaling:groupName")) | .Value'
++ ASG_NAME=
+++ echo
+++ tr -d '"'
++ ASG_NAME=
++ aws autoscaling set-instance-protection --instance-ids i---- --auto-scaling-group-name --protected-from-scale-in --region us-east-2
usage: aws [options] <command> <subcommand> [<subcommand> ...] [parameters]
To see help text, you can run:

  aws help
  aws <command> help
  aws <command> <subcommand> help
aws: error: argument --auto-scaling-group-name: expected one argument

> Blockquote

Upvotes: 0

Views: 264

Answers (1)

Jaishree Mishra
Jaishree Mishra

Reputation: 545

Solved issue by recommendation of @chepner. Modified second line by

ASG_NAME=$(aws ec2 describe-tags --filters "Name=resource-id,Values=$INSTANCE_ID"  --region us-east-2 --query 'Tags[1].Value')

Upvotes: 1

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