--- File.rename(from, to)

    ե̾ѹޤǥ쥯ȥ꤬ۤʤˤϰưԤ
    ޤrename(2) [manual page] 򻲾ȤƤưΥե
    뤬¸ߤˤϾ񤭤ޤ

    եΰư 0 ֤ޤԤ㳰 
    Errno::EXXX ȯޤ

