--- FileUtils.ln( old, new, *options )
  Options: force noop verbose

  old ؤΥϡɥ new ޤ
  new Ǥ¸ߤǥ쥯ȥǤȤ new/old ޤ
  new Ǥ¸ߤǥ쥯ȥǤʤʤ㳰 Errno::ENOTDIR ȯޤ
   force ץꤷȤ new 񤭤ޤ

    FileUtils.ln 'gcc', 'cc', :verbose
    FileUtils.ln '/usr/bin/emacs21', '/usr/bin/emacs'

--- FileUtils.ln( list, destdir, *options )
  Options: force noop verbose

  list[0] ؤΥϡɥ destdir/list[0]list[1] ؤ
  ϡɥ destdir/list[1] Ĥޤ
  destdir ǥ쥯ȥǤʤ㳰 Errno::ENOTDIR ȯޤ

    include FileUtils
    cd '/bin'
    ln %w(cp mv mkdir), '/usr/bin'

