Terminate EC2 Spot/On-Demand instance by name

Declare function to terminate instance by Id

function ec2-terminate-instance($instid){
$ec2.TerminateInstances((new-object Amazon.EC2.Model.TerminateInstancesRequest).WithInstanceId($instid)).TerminateInstancesResult.TerminatingInstance[0]

Get instance by name and terminate it

$filter = (new-object Amazon.EC2.Model.Filter).WithName('tag:Name').WithValue('YourInstanceName')
(Get-EC2Instance -Filter $filter -Region 'us-east-1').RunningInstance | % { ec2-terminate-instance $_.InstanceId }

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