--- chown(owner, group)

    եΥʡȥ롼פѹޤѡ桼ե
    Υʡȥ롼פѹǤޤͭԤѹ
     0 ֤ޤѹ˼Ԥ㳰 Errno::EXXX ȯ
    ޤ

    owner  group ϡchown(2) [manual page] Ʊͤ
    ͤǻꤷޤ
    nil ޤ -1 ꤹ뤳Ȥǥʡ䥰롼פ򸽺
    Τޤޤˤ뤳ȤǤޤ

