#!/usr/bin/ruby

def file_open(fname, mode)
  begin
    file = open(fname, mode)
  rescue Errno::ENOENT
     STDERR.print "#{$0}: can't open #{fname}\n"
     return nil
  end
  return file
end

ARGV.each do |fname|
  if file = file_open(fname, "r")
    print "opening #{fname}\n"
    file.close
  end
end