CentOS cannot run the dialog solution

Https://www.ezloo.com/2007/11/centos_dialog_installation.html

I installed under the virtual machine CentOS system, the most recent to do a big shell experiment, but in the Run dialog Display command not found, I consulted the expert on the Forum, now can be used.
Solution: At the command line, input yum install dialog* and then the system will automatically download the file, we just have to prompt input y/n when the input a few y on it.
The expert on the forum said, may not add dialog to the PATH inside, this also possibly, may use the Export to add, dialog in/usr/bin/dialog Catalog, then on Export path= $PATH:/usr/bin can. Then echo $PATH take a look at the directory where dialog is added. In general, the/usr/bin directory has been added to the path.