My installation puts a folder inside /Applications that holds the .app and some other support files (sorry, it's old). Within that folder, there is another folder that holds a pdf Help File. The structure is like this (note spaces in names): /Applications/My App Folder/My App.app /Applications/My App Folder/Help Folder/Help File 3.3.pdf So if you install the new version on top of an older version, all files having the same names get replaced except for the Help File which has a version number at the end of it. So the user can end up with several older help files. So I wanted to have the post-install script that is attached to my .app bundle delete any older Help Files. In testing this, this WORKS to delete an older file (if it exists, and if not, who cares): rm -rf "$2/../Help Folder/Help 3.2.pdf" But I had gotten the impression that you should use sudo and the current user for everything, as shown in most of the examples I've seen here. If I try this, it doesn't work: /usr/bin/su $USER -c "/usr/bin/rm -rf \"$2/../Help Folder/Help 3.2.pdf\"" I must have something wrong with the quoting, I tried it without quotes, numerous variations of quoting and escaping etc., but I can't see it. Or there's something I'm misunderstanding about the examples I've seen. Thanks, - Stephen _______________________________________________ Do not post admin requests to the list. They will be ignored. Installer-dev mailing list (Installer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/installer-dev/site_archiver%40lists.... This email sent to site_archiver@lists.apple.com