How do I get exec() to display errors?

[Robert S]

I would like to display error messages put out by shell commands. For
example the following code gives no output and the array $output has no
values:

<?php
exec( 'lss', $output );
var_dump( $output );
?>

...assuming that I don't have an executable called 'lss' on my computer.

The equivalent on the command line displays the error message:

# php -r 'exec( "lss", $output );'
# sh: lss: command not found

How do I get the exec() command to display errors?

I've tried `exec( 'lss 2/dev/stout', $output );' with no success.

[Peter van Schie]

Robert S schreef:

I would like to display error messages put out by shell commands. For
example the following code gives no output and the array $output has no
values:

<?php
exec( 'lss', $output );
var_dump( $output );
?>

How about just:
<?php
$strRawOutput = exec( 'lss', $output );
var_dump($strRa wOutput);
?>

This only retrieves the last output line though. If you need more then
you should use passthru() instead of exec().

HTH,
Peter.
--
http://www.phpforums.nl

[Robert S]

How about just:

<?php
$strRawOutput = exec( 'lss', $output );
var_dump($strRa wOutput);
?>

This still doesn't print the error message. It only prints whatever is
directed to stdout.

[Jerry Stuckle]

Robert S wrote:

I would like to display error messages put out by shell commands. For
example the following code gives no output and the array $output has no
values:

<?php
exec( 'lss', $output );
var_dump( $output );
?>

..assuming that I don't have an executable called 'lss' on my computer.

The equivalent on the command line displays the error message:

# php -r 'exec( "lss", $output );'
# sh: lss: command not found

How do I get the exec() command to display errors?

I've tried `exec( 'lss 2/dev/stout', $output );' with no success.

2redirection is a shell function, not the OS. You'll need to use
shell_exec() to allow the redirection.

Also, the syntax should be 2>&1. That way if stdout is also redirected
stderr will follow.

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