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January 12, 2017 01:23
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Find un-used AMIs
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| #!/bin/bash -e | |
| set -o pipefail | |
| # File 1 is the list of our AMIs | |
| # File 2 is the list of AMIs used by our instances | |
| # Column 1 is an image of ours that is not in use | |
| # Column 2 is an AMI that is in use that isn't one of ours | |
| # Column 3 is the list of our AMIs that are in use. | |
| comm -23 \ | |
| <(aws ec2 describe-images --owners self | jq -r ' [.Images[].ImageId] | sort | unique | .[]') \ | |
| <(aws ec2 describe-instances | jq -r '[.Reservations[].Instances[].ImageId] | sort | unique | .[]') |
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Thank you for the
<( ... )construct! I've wanted that so many times, but not known about it!