Using cmd tools when hosting a site

Do webapp hosting sites such as webfaction.com support the use of cmd tool开发者_JAVA百科s such as pdftk and pdftotext? For example, if in my django-powered site I do something like

subprocess.Popen("pdftk.exe....")

would this still work when I begin hosting the site?

On webfaction at least, you can install such tools in your own directory and then call them. If your process starts hogging memory, it may get killed off. For example see this thread on the forum.