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//µÚÒ»ÖÖ·½Ê½
exec($cmd,$str,$result);
echo "result = $result <br/>";
if ($result != 0) {
    echo "failed";
}
print_r($str);
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//µÚ¶þÖÖ·½Ê½
$output = shell_exec("/usr/bin/sudo /usr/bin/whoami 2>&1);
echo "output = $output";
#Êä³ö´íÎó
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Defaults requiretty
¼üÈëÃüÁîvisudo,´ò¿ªsudoersÎļþ£¬±à¼­¸ÃÎļþ×¢Ê͵ôDefaults requirettyÒ»ÐУ¬²¢ÔÚÎļþĩβ׷¼ÓApache ALL=NOPASSWD:/bin/ps
apache ALL = (root) NOPASSWD: /usr/bin/whoami


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