How to change ri1.8 to ri in shell command?

ruby1.8 and ri1.8 were installed in my computer ,there is strange thing
:
pt@pt-laptop:~$ ri array
The program ‘ri’ is currently not installed. You can install it by
typing:
sudo apt-get install ri

when i input
pt@pt-laptop:~$ ri1.8 array
lots of output which is what i want
can i change ri1.8 in shell command to ri in my computer?

On Tue, May 18, 2010 at 6:28 PM, Pen T. [email protected] wrote:

can i change ri1.8 in shell command to ri in my computer?

Well, if you install the ‘ri’ package in Ubuntu it installs a symbolic
link for ri that points to ri1.8. If you don’t want to do that, you
could always make the symbolic link yourself:

sudo ln -s which ri1.8 /usr/local/bin/ri
(note those are backticks, not quotes)

-Jonathan N.