If you find or write a piece of software that you want everybody to use, here's what you do.
If it's a Linux executable file, put it at /home/p/demo/demo/bin.Linux
If it's an IRIX executable file, put it at /home/p/demo/demo/bin.IRIX.
If the same file is compatible with both OS's, make one to be a symlink to the other.
If it's a larger application with a few or lots of files, make a
directory for it under /home/p/demo/demo/util, install it there,
and put a starting script at demo/demo/bin.Linux or
bin.IRIX.
After the installation is complete, cd to
/home/p/demo/demo/util/yourthing and type "makedemo" so the
entire tree will be owned by the whole group and not you alone.
Finally, post a message to the Bulletin
Board to tell people of your new addition. Add a link to your
message to the DEMO software page.