How to make a Variable read-only (constant) in Bash [New Question]

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How to make a Variable read-only (constant) in Bash

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How to make a Variable read-only (constant) in Bash
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A quick question, answered on Heelpbook, about "How to make a Variable read-only (constant) in Bash". Useful if we need use constants in Bash scripts on a Linux system.
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Heelpbook.net