Thanks to SuperBovine I have downloaded & had a play with Cronnix. For more details on why I need something like it see here. http://forums.macrumors.com/showthread.php?t=121728 Although I can get it to open files on schedule, I can't get it to close them. I've tried a number of commands gleaned from various Unix command webpages but I'm almost out of my depth here. Any tips? BTW: This seems to open them fine at 10:10am every day. 10 10 * * * /usr/bin/open"/Users/bluevelvet/Desktop/test.pdf"