--- ` str

    ʸ str ޥɤȤƼ¹ԤνϤʸȤ
    ֤ޤΥ᥽åɤ `str` ηǸƤФޤ
    (%x(...) [ƥ/%ˡ] ȤɽˤäƤƤӽФޤ
    ܺ٤ ޥɽ 򻲾ȤƤ)

    ¹Ԥޥɤνλơ $? ǻȤǤޤ

    ޥɤνϤɬפʤñ˥ޥɤ¹Ԥʤ
    system Ȥޤäü椹륳ޥɤǤ
    `command` ϼԤ뤫⤷ޤ

