There is an important omission in RHEL 8, RH124, Chapter 5, Section 5.
Variable names can contain uppercase or lowercase letters, digits, and the underscore character (_). For example, the following commands set shell variables:
It fails to let the reader know that variable may not begin with a digit (numeral). Trying to do so gives a command not found... error.
Program Lead at Arizona's first Red Hat Academy, est. 2005
Estrella Mountain Community College
