Delete the old instance in AWS

Question

I am trying to delete the old instance using the following command

aws ec2 describe-snapshots --filters Name=description,Values=$Description | grep "SnapshotId" | head -n -$Local_numbackups | awk '{print $2}' | sed -e 's/,//g' | xargs -n 1 -t aws ec2 delete-snapshot --snapshot-id

This is not working can someone help me as where I have done the mistake?

Answer 1

# Get array of snapshot IDs sorted by age (oldest to newest) //can be done from your console
snapshots=($(aws ec2 describe-snapshots --filters Name=description,Values=$Description --query 'Snapshots[*].[StartTime,SnapshotId]' --output text | sort -n | sed -e 's/^.*\t//'))
# Get number of snapshots
count=${#snapshots[@]}

if [ "$count" -lt "$Local_numbackups" ]; then
  echo "We already have less than $Local_numbackups snapshots"
  exit 0
else
  # Drop the last (newest) $Local_numbackups IDs from the array
  snapshots=(${snapshots[@]:0:$((count - Local_numbackups))})
  # Loop through the remaining snapshots and delete
  for snapshot in ${snapshots[@]}; do
    aws ec2 delete-snapshot --snapshot-id $snapshot
  done
fi

Source: Github