/usr/share/genometools/gtdata/doc/extractfeat.lua is in genometools-common 1.5.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | if not gtdata_doc_dir then gtdata_doc_dir = "./" end
dofile(gtdata_doc_dir.."regionmapping.lua")
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