Printing/updating output to the screen

[Daniel Pryde]

Hi there. I hope this isn't a stupid question to ask, but does anyone 
know how to print out a string without moving to a new line each time 
and simply updating the first line. An example would be, if I wanted to 
have a percentage progress counter that was constantly updating. I'm 
unsure how to do this without printing to a brand new line. Any help 
would be greatly appreciated. Thanks.

Daniel