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→Tutorial Reference Material
* [http://linuxcommand.org/lc3_man_pages/readh.html read]
* [https://man7.org/linux/man-pages/man1/readonly.1p.html readonly]
* [https://www.gnu.org/software/bash/manual/html_node/Command-Substitution.html Using Command Substitution]
| style="padding-left:15px;"|Control Flow Statements
* [https://en.wikipedia.org/wiki/Control_flow Purpose]
