I have built Ruby from source, installed gems & rails on a MacBook
pro.  I installed the source for a working Rails application in a
directory /rails_apps.  I cd to the application directory under rails
apps and in the terminal I enter:

script/server

Terminal responds:
: No such file or directory

sudo script/server provides the same response
ls -la script/server returns:
-rwxr-xr-x   1 pogo  admin  98 Nov 13  2006 script/server

I have all of 2 weeks experience on a Mac, which probably explains the
basic problem.  Can someone advise?