How to parse aws-cli output using jq containing arguments using the --arg switch?

Question

I'm trying to parse the output of AWS cli using jq where the jq query contains bash variables and by using the --arg switch like so:

$ aws ec2 describe-instances --region $region | jq --arg environment "$Environment" --arg br "$BUILD_NUMBER" --arg app "$App" -r '.Reservations[].Instances[].Tags[]?.Value | select(startswith("Company-$environment-$br-$app")

I get a new line when I run the command.

This is the output when I use hard coded auto scaling group name:

itai@Itais-MBP ~/Downloads -  $ aws ec2 describe-instances --region $region |   jq --arg environment "$Environment" --arg br "$BUILD_NUMBER" --arg app "$App"   -r '.Reservations[].Instances[].Tags[]?.Value | select(startswith("Company-Dev-60-Api") )'
Company-Dev-60-ApiServersASG-19L10K16RUXTE
Company-Dev-60-ApiServersASG-19L10K16RUXTE
itai@Itais-MBP ~/Downloads -  $

You can see the values of the variables are set:

itai@Itais-MBP ~/Downloads -  $ echo $Environment
Dev
itai@Itais-MBP ~/Downloads -  $ echo $App
Api
itai@Itais-MBP ~/Downloads -  $ echo $BUILD_NUMBER
60

So what am I doing wrong?

peak · Accepted Answer · 2017-12-22 21:04:59Z

2

The jq language has its own way of combining variables. In jq, the expression you wrote:

"Company-$environment-$br-$app"

is just a vanilla JSON string.

One option would be to use jq's support for interpolation:

"Company-\($environment)-\($br)-\($app)"

Another option would be to use jq's string-concatenation operator, +.

You could also use join("-"). And so on.

answered Dec 22, 2017 at 21:04

peak

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