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Here is an answer rather than a question that I thought I would share.

In my first attempt, I was using grep to find a list from file.1 within another file, file.2 which I then needed to paste...

This should work: awk '{f=$1;sub("-.*\\.","_"$2".",$1);system("mv "f" "$1)}' file-with-filenames

Is it literal contents of the file containing filenames? file-abcd.pdf #to be renamed [tab] 123456789 #the new filename
file-abce.pdf #to be renamed [tab] 809809231 #the new filename
Or is it just:...