http://www.undergroundnews.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=9;t=000024

go to the tutorial in that thread. take the whole thing. By the time you finish you understand you *nix system a lot more. "./" is like a run command for compiled binary files. to be able to run the file from any directory just by typing the name place it into /usr/bin or /usr/local/bin then from the command like you can just type the program name and it will run.