Ravi Sir's Cards › AWS
trap cleanup
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
Why do we need it?
Scripts must clean up always.
What is it?
trap runs code on a signal.
How to do it
EXIT covers normal and error exits.
Example
Remove the lock file.
trap 'rm -f /tmp/job.lock' EXIT