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If you have sufficient ram, you could have nawk read the tempfile once, when it starts, store its lines in an array, and then read the IDs from standard input. For each ID you can then iterate...

That doesn't look like correct syntax for awk/nawk. Nothing's inside a code block. Try putting it inside BEGIN { ... }

I belive you are missing curly bracers and some ";"

nawk -v s=$x '{ if($2 == s); getline ; getline; if ($1 == "IMAGE_SIZE") print s":"$2"-"$3 }'

It's taking negative numbers to mean parameters. Try giving it -- to tell it there's no further parameters.

set -A arr -- ...