**To detach an instance from an Auto Scaling group** This example detaches the specified instance from the specified Auto Scaling group:: aws autoscaling detach-instances --instance-ids i-93633f9b --auto-scaling-group-name my-auto-scaling-group --should-decrement-desired-capacity The following is example output:: { "Activities": [ { "Description": "Detaching EC2 instance: i-93633f9b", "AutoScalingGroupName": "my-auto-scaling-group", "ActivityId": "5091cb52-547a-47ce-a236-c9ccbc2cb2c9", "Details": {"Availability Zone": "us-west-2a"}, "StartTime": "2015-04-12T15:02:16.179Z", "Progress": 50, "Cause": "At 2015-04-12T15:02:16Z instance i-93633f9b was detached in response to a user request, shrinking the capacity from 2 to 1.", "StatusCode": "InProgress" } ] }