aws ec2 find instance id

# to get a list of DS instances
aws ec2 describe-instances --output text | grep Name   |grep ds | awk '{print $NF}'
# aws ec2 describe-instances --filters 'Name=tag:Name,Values=*.ds'
# aws ec2 describe-instances --filters 'Name=tag:Cluster,Values=dsclusterprod1' --output text | grep -w Name
aws ec2 describe-instances --filters 'Name=tag:Cluster,Values=dsclusterprod1' --output text | grep -w Name | awk '{print $NF}' > ds.instances
aws ec2 describe-instances --filters 'Name=tag:Cluster,Values=dsclusterstg1' --output text | grep -w Name | awk '{print $NF}' >> ds.instances


## to get instanceid of instances:
 for  instance in `cat ds.instances`; 
 do   instance_id=$(aws ec2 describe-instances --filters "Name=tag:Name,Values=${instance}" --output text --query 'Reservations[*].Instances[*].InstanceId');   echo "${instance}, ${instance_id}"; done > ds.instances_with_ids

 
## create image of ds instances
timeStamp=$(date +"%Y-%m-%e_%H-%M-%S")
while IFS=,; read instance_name instance_id; do 
#aws ec2 create-image --instance-id ${instance_id} --name ${instance_name}_${timeStamp} --no-reboot
echo aws ec2 create-image --instance-id ${instance_id} --name ${instance_name}_${timeStamp} --no-reboot
done < ds.instances_with_ids





Assuming that you are using the convention of putting the name of the instance in a tag with the key of "Name" (this is what the AWS Console does when you enter a name), then you can use the --filters option to list those instances with aws-cli:

aws ec2 describe-instances --filters 'Name=tag:Name,Values=dev-server-*'
If you just wanted the instance ids of those instances, you could use:

aws ec2 describe-instances --filters 'Name=tag:Name,Values=dev-server-*' \
  --output text --query 'Reservations[*].Instances[*].InstanceId'
Note: --query may require a recent version of aws-cli but it's worth getting.








### jq example
[root@control ~]# aws ec2 describe-instances --filters 'Name=tag:Name,Values=n1.ds'   | jq '.Reservations[].OwnerId'


========

[root@control ~]# cat this.txt  |jq '.Reservations[].Instances[].Tags'
[
  {
    "Value": "n1.ds",
    "Key": "Name"
  },
  {
    "Value": "Goll",
    "Key": "CreatedBy"
  },
  {
    "Value": "Analytics/DS",
    "Key": "Team"
  },
  {
    "Value": "dsclusterprod1",
    "Key": "Cluster"
  }
]
[root@control ~]# cat this.txt  |jq '.Reservations[].Instances[].Tags | map(select(.Key == "Name"))'
[
  {
    "Value": "n1.ds",
    "Key": "Name"
  }

=====
 aws ec2 describe-instances --filter Name=tag:Cluster,Values=dsclusterprod1 | jq '.Reservations[].Instances[].Tags[]| select (.["Key"] == "CreatedBy")|.Value'
 
 
 
 
 aws ec2 describe-instances --filter Name=tag:Cluster,Values=dsclusterprod1 | jq '.Reservations[].Instances[].Tags[] | select(.Key == "Name")| .Value' | sed 's/"//g'






aws ec2 describe-instances --filter "Name=instance-state-name,Values=running" "Name=tag-key,Values=Name" "Name=tag-value,Values=*email*"