--- Etc.getpwuid([uid])
    uid桼IDȤpasswdȥ֤ͤ
    Etc.getpwnamƱͤǤ롣άˤ
    getuid(2) [manual page]ͤѤ롣ܺ٤
    getpwuid(3) [manual page] 򻲾ȤΤȡ

