/usr/lib/ruby/1.9.1/tk/after.rb is in libtcltk-ruby1.9.1 1.9.3.0-1ubuntu1.
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 | #
# tk/after.rb : methods for Tcl/Tk after command
#
# $Id: after.rb 25189 2009-10-02 12:04:37Z akr $
#
require 'tk/timer'
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