/usr/bin/enable-ec2-spot-hibernation is in hibagent 1.0.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/bash
# Add this script in your user-data to turn on the hibernation support
# for the EC2 Spot Instances.
# Make sure the agent is added to the auto-start
update-rc.d hibagent defaults
# And start it
exec service hibagent start
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