aws cli + jq example

gistfile1.sh

wget http://stedolan.github.io/jq/download/linux64/jq 
aws ec2 describe-instances --filters "Name=tag:Name,Values=$NAME" \
  "Name=instance-state-name,Values=running" \
  |  jq -r \
  ".Reservations[] | .Instances[] | .InstanceId" \

aws ec2 describe-volumes --filters \
  "Name=status,Values=available" \
  | jq -r ".Volumes[] | .VolumeId" \

aws ec2 describe-instances | jq '.Reservations[].Instances[] | select(.LaunchTime > "2015-01-28") | select(.State.Code != 48) | [.LaunchTime, .State.Name, (.Tags[]|select(.Key=="Name")|.Value)]'

# no dotdee
aws ec2 describe-instances | jq --arg yest $(python -c "import datetime; t = datetime.datetime.now() - datetime.timedelta(hours=24); print t.strftime('%Y-%m-%d')") -r '.Reservations[].Instances[] | select(.LaunchTime > $yest) | select(.State.Code != 48) | (.Tags[]//[]|select(.Key=="Name")|.Value) as $name | "Host \($name) \nHostname \(.PrivateIpAddress)"' >> ~/.ssh/config

Scenario

You should not assume that all vpc has .Tags[]. I just faced the scenario below with the output of:

aws ec2 describe-vpcs > outputfile.json

Error

jq -r '.Vpcs[]|[.VpcId,.CidrBlock, (.Tags[]|select(.Key=="Name")|.Value)] | @csv' outputfile.json

jq: error (at outputfile.json:nnn): Cannot iterate over null (null)

Solution

Make Tags optional..

jq -r '.Vpcs[]|[.VpcId,.CidrBlock, (.Tags[]?|select(.Key=="Name")|.Value)] | @csv' outputfile.json

is there a way to assign a value to "Name" if the tag does not exist?.

For example:
aws ec2 describe-instances | jq -c '.Reservations[].Instances[] | { instanceid:.InstanceId, name:(.Tags[]? | select(.Key=="Name") | .Value)}'
will not return the instances that have tags but not the "Name" tag.

Appreciate your insights.

Found this article recently. Not sure how many examples are here and there but still it is worth linking, I believe.
https://medium.com/circuitpeople/aws-cli-with-jq-and-bash-9d54e2eabaf1