Ravi Sir's Cards › AWS
Debug in 4 steps
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?
Syntax only.
bash -n x.sh
What is it?
Lint.
shellcheck x.sh
How to do it
Trace with line numbers.
PS4='+ ${LINENO}: ' bash -x x.sh
Example
Read the logs.
journalctl -t x -n 50