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End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Zlib::GzipReader.open

Zlib::GzipReader.open(filename) {|gz| ... }

Opens a file specified by filename as a gzipped file, and returns a GzipReader object associated with that file. Further details of this method are in Zlib::GzipReader.new and ZLib::GzipFile.wrap.

See also .new .zcat #each also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0