/usr/lib/ruby/1.8/tk/after.rb is in libtcltk-ruby1.8 1.8.7.352-2ubuntu1.
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 | #
# tk/after.rb : methods for Tcl/Tk after command
#
# $Id: after.rb 11708 2007-02-12 23:01:19Z shyouhei $
#
require 'tk/timer'
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