By davecoventry on

I'm trying to get the difference between 2 files on my Debian system.

$output=`diff path/to/file1 path/to/file2`;
echo "<hr>".$output."<hr>";

Gives a page with "<hr><hr>".

However, this:

$output=`ls -la path/to/files/`;
echo "<hr>".$output."<hr>";

Gives me a listing of the directory as expected.

Do the executables need to be registered somewhere?

⋅ Categories: Drupal 6.x

Comments

criznach’s picture

criznach commented

Does your apache user have the necessary permissions to access the files and to execute the diff command?

http://www.trailheadinteractive.com

davecoventry’s picture

davecoventry commented

Odd.

$output=`diff path/to/file1 path/to/file2>/tmp/difffile`;
echo "<hr>".$output."<hr>";

Produces the file /tmp/diffile with the 'diff' output.

But I would have expected the following:

$output=`diff path/to/file1 path/to/file2`;
echo "<hr>".$output."<hr>";

to produce the contents of the diff file as the $output.