Now, this might sound silly, but having compiled a program, how do you run it? I wrote and compiled a version of Ackermann's function. It is in a folder Ackermann. I have a terminal window open and I am in the folder. ls shows the executable ack. When I type ack I get "The program'ack' not installed ..." What do I do next? -ash Elect Cthulhu! Vote the greater evil.