php 调用shell实现文件下载功能

用php来实现远程文件下载，所以考虑到了用shell结合php来实现

shell脚本如下：

#!/usr/bin/expect -f
 ####set ip address ##############
 set ip [lindex $argv 0 ]
 ####set username ################
 set username [lindex $argv 1 ] 
 ####set password  ###############	
 set password [lindex $argv 2 ] 
 ###########
 set src_ [lindex $argv 3 ]
 set timeout 10
 spawn scp -r $username@$ip:$src_ /download/aa
 expect {
 "*yes/no" { send "yes\r"; exp_continue}
 "*password:" { send "$password\r" }
 }
 expect "#*"
 #send "ls -la /usr/local/\r"
 #send  "exit\r"
 #expect eof

php文件如下：

<?php
$ip = '127.0.0.1';//ip地址
$username = 'root'; //用户名
$passwd = 'wangjian';
$src_ = '/etc/';
$des_ = '/download/aa' ; //本地的路径
$scmd = "/sh/test1.sh ".$ip.' '.$username.' '.$passwd.' '.$src_.' '.$des_ ;
$s = exec($scmd,$array,$status);
echo $s ;
echo '<pre>';
print_r($array);