如何使用PHP运行Shell脚本

Question

I have a php file

<?php
$op=exec("/usr/bin/sh /home/muralik/www/html/testing/testin.sh >> /home/muralik/www/html/testing/abc.log 2>&1 &",$rs);
echo "OP = ".$op;
echo "<br>RS = <pre>";
print_r($rs);
echo "</pre>"
?>

testin.sh

while(true)
do
echo "standard output"
echo "abc"
sleep 2
done

When i open the php file in localhost or web server. the shell script is not running.

What should i do. thanks in adavance.

Answer 1

I believe your script is running, you're just not seeing the output?

The command you're running in your exec redirects both STDOUT and STDERR to abc.log:

/usr/bin/sh /home/muralik/www/html/testing/testin.sh >> /home/muralik/www/html/testing/abc.log 2>&1

Because everything is getting redirected, nothing will end up in $rs, and $op will be empty as well as there will be no last line from the executed command.

Also, your shell script is going to run in an infinite loop, meaning it will never return anything, meaning the exec() should never return as it waits for the execution to finish.

Answer 2

Usually (for security reasons) scripts run from a browser will not run shell commands.

In order to make it work you need to change your .htaccess file (this will tell your server to treat your script as an appliacation)

Add the following lines in your .htaccess:

Options ExecCGI 
AddHandler cgi-script .php

This will allow any php files in the CGI folder to run as an application