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% ruby -e 'puts Dir.new(".").entries.find_all{|f| File.file?(f) and not open(f).read.index("special") }'
上書きのニュアンスを含んでしまうかも…。隠面処理など。
「地図の重ね合わせ」などに使われているらしい。
OVERLAY - The process of superimposing two or more maps (see
figure), through registration to a common co-ordinate system,
such that the resultant maps contain the data from both maps
for selected features. Although the term overlay can be
applied to paper based maps, more often it applies to the use
of digital data, nevertheless, the principal is the same.
http://pcsa.hrsa.gov/datamaps/glossaries/gis_glossary.htm
(GIS における用例)