If you use another shell, such as the C shell, you must modify your commands accordingly.
For example, add /usr/local/ccm72 to the path using the sh shell as follows:
$ PATH=/usr/local/ccm71/bin:$PATH; export PATH
Add /usr/local/ccm72 to the path using the csh shell as follows:
% setenv PATH /usr/local/ccm72/bin:$PATH