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→Tutorial Reference Material
* [https://man7.org/linux/man-pages/man1/readonly.1p.html readonly]
* [https://www.gnu.org/software/bash/manual/html_node/Command-Substitution.html Command Substitution]
| style="padding-left:15px;"|'''Control Flow Statements:'''
* [https://en.wikipedia.org/wiki/Control_flow Purpose]
* [https://www.computerhope.com/unix/test.htm test command]
