Patryk Soika wrote:
> I'm new to ruby, and attempting to install it for the first time. 
> Running as root under CentOS 4, I downloaded the sources, configure, 
> make, and make install, all with no apparent errors.
>
> However, whenever I attempt to run it, I get this:
>
>   -bash: /usr/bin/ruby: No such file or directory
>
> I assume that I'm missing something fairly obvious, but I don't know 
> where.
>
> Help?
>
>   

How are you trying to run it? Maybe it isn't installed at /usr/bin/ruby. 
Try:

whereis ruby

and/or

which ruby

To see where it is installed and which location bash is trying to use.
Also, might there have been an older/default installation of Ruby that 
is messing it up?

-Justin