/usr/bin/defid is in id-utils 4.6+git20120811-4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #! /bin/sh
case $1 in
--h|--he|--hel|--help|--v|--ve|--ver|--vers|--versi|--versio|--version)
exec gid "$@";;
esac
for sym
do
gid $sym |egrep '(}[ ]*|:[ ]*#[ ]*define[ ]+)'$sym'|typedef\>.*[ ]+'$sym
done
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