def touch(list, options = {})
    fu_check_options options, OPT_TABLE['touch']
    list = fu_list(list)
    created = nocreate = options[:nocreate]
    t = options[:mtime]
    if options[:verbose]
      fu_output_message "touch #{nocreate ? '-c ' : ''}#{t ? t.strftime('-t %Y%m%d%H%M.%S ') : ''}#{list.join ' '}"
    end
    return if options[:noop]
    list.each do |path|
      created = nocreate
      begin
        File.utime(t, t, path)
      rescue Errno::ENOENT
        raise if created
        File.open(path, 'a') {
          ;
        }
        created = true
        retry if t
      end
    end
  end
Options: noop verbose

Updates modification time (mtime) and access time (atime) of file(s) in
+list+.  Files are created if they don't exist.

FileUtils.touch 'timestamp'
FileUtils.touch Dir.glob('*.c');  system 'make'