douchi5822
2014-07-20 03:47
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从PHP脚本在后台使用&&执行多个linux命令

Ok so I have a operating system Ubuntu. I have lampp. Now I wanna execute some command in the background which is going to take atleast 10-15 minutes to execute. I want to execute this command from PHP script from web interface not cli.

First Instance:

When I do this , the php script is successfully able to run the command in the background:

command1 &> /dev/null &

Second Instance:

But when I do this:

command1 &> /dev/null && command2 &

,

Then the command does not run in background, the php script pauses until this command executes. I want the command2 to execute after command1 is completed so that I (or my php script) can know that command1 has been executed. But it should be in background else my php script doesn't execute on time.

When I do the second instance from command line, it is able to run in background, but when I do it from php script then it is unable to run in background.

I am using the exec function of php to execute those commands.

<?php
exec('command1 &> /dev/null && command2 &',$out,$ret);
?>

Any help would be appreciated.

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好的，所以我有一个操作系统Ubuntu。 我有灯泡。 现在我想在后台执行一些命令，这将至少执行10-15分钟。 我想从Web界面而不是cli从PHP脚本执行此命令。

第一个实例：

当我这样做时 这个，php脚本能够成功地在后台运行命令： 

  command1＆amp;＆gt;  / dev / null＆amp; 
   
 
 
 第二个实例：  
 
 
但是当我这样做时：   
 
 
  command1＆amp;＆gt;  / dev / null＆amp;＆amp;  command2＆amp; 
   
 
 
， 
 
 
然后命令不在后台运行，php脚本暂停，直到执行此命令。 我希望在command1完成后执行command2，以便我（或我的php脚本）可以知道command1已经执行。 但它应该在后台，否则我的PHP脚本不会按时执行。 
 
 
当我从命令行执行第二个实例时，它可以在后台运行，但是当我这样做时 它来自PHP脚本然后它无法在后台运行。 
 
 
我使用php的exec函数来执行这些命令。 
 
 
 ＆lt;？php 
exec（'command1＆amp;＆gt; / dev / null＆amp;＆amp; command2＆amp;'，$ out，$ ret）; 
？＆gt; 
   \  n 
 
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2条回答 默认 最新

  • dongshui2254 2014-07-20 04:08
    最佳回答

    Try this:

    <?php
exec('(command1 && command2) >/dev/null &',$out,$ret);

    What it's doing is launching your commands in a subshell so that command1 runs first and then command2 only runs after command1 completes successfully, then redirects all the output to dev/null and runs the whole thing in the background.

    If you want to run command2 regardless of the exit code of command1 use ; instead of &&.

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