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Shell_exec is not working

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# 1  
Old 09-15-2019
Shell_exec is not working
I am trying to execute a command with shell_exec but this command does not work, other commands work

Code:
<?php
    $output = shell_exec("tail /var/log/syslog");
    echo "<pre>$output</pre>";
    ?>

# 2  
Old 09-16-2019
Please execute and post the error from your PHP error.log file.

When we code in PHP, we always run a tail on the PHP error.log file so we can see errors as the occur.
This User Gave Thanks to Neo For This Post:
Rodrigo_Bueno
# 3  
Old 09-20-2019
Code:
[Fri Sep 20 16:29:05.960464 2019] [mpm_prefork:notice] [pid 1090] AH00163: Apache/2.4.29 (Ubuntu) configured -- resuming normal operations
[Fri Sep 20 16:29:05.960506 2019] [core:notice] [pid 1090] AH00094: Command line: '/usr/sbin/apache2'
tail: cannot open '/var/log/syslog' for reading: Permission denied

# 4  
Old 09-20-2019
So...?
This User Gave Thanks to RudiC For This Post:
Rodrigo_Bueno
# 5  
Old 09-22-2019
Quote:
Originally Posted by Rodrigo_Bueno
Code:
[Fri Sep 20 16:29:05.960464 2019] [mpm_prefork:notice] [pid 1090] AH00163: Apache/2.4.29 (Ubuntu) configured -- resuming normal operations
[Fri Sep 20 16:29:05.960506 2019] [core:notice] [pid 1090] AH00094: Command line: '/usr/sbin/apache2'
tail: cannot open '/var/log/syslog' for reading: Permission denied

So, it pretty obvious that since your core PHP process cannot read /var/log/syslog; hence the basic problem is not shell_exec, the problem is that this file is not readable by your LAMP server process.

Please execute these commands:

Code:
ls -l /var/log/syslog

and also

Code:
ps aux | grep -i apache | tail -10

... and cut-and-paste the results (using our code tags) into your reply.
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