验证应用程序是否在服务器上

Question

I have an own webserver and for one of my clients I need to be able to search through PDF's. I've asked my hostingprovider to install the xPDF package. Now I've come to testing and I'm calling this line of code in a PHP script:

$content = shell_exec('/usr/local/bin/pdftotext test.pdf -');

The only thing is, I'm getting a NULL result with. So, my question, is there a way to validate if the program is really installed? Btw, I'm not even sure if the path is correct. I'm pretty new if it comes to having an own webserver. I've taken this example from : http://davidwalsh.name/read-pdf-doc-file-php

Answer 1

If you have shell access, log in using SSH, and try

whereis pdftotext

if the only thing you get is a

pdftotext:

then it is most likely not (or not properly) installed.