/usr/lib/ruby/2.5.0/psych/y.rb is in libruby2.5 2.5.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # frozen_string_literal: true
module Kernel
###
# An alias for Psych.dump_stream meant to be used with IRB.
def y *objects
puts Psych.dump_stream(*objects)
end
private :y
end
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