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readonly: add page (#10786)

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* readonly: add page

* Update readonly.md

* Update readonly.md

* Update pages/common/readonly.md

Co-authored-by: Reinhart Previano Koentjoro <reinhart_previano@yahoo.com>

* Update readonly.md

* Update pages/common/readonly.md

Co-authored-by: Jack Lin <blueskyson1401@gmail.com>

* Update pages/common/readonly.md

* Update pages/common/readonly.md

* Update pages/common/readonly.md

---------

Co-authored-by: Reinhart Previano Koentjoro <reinhart_previano@yahoo.com>
Co-authored-by: Jack Lin <blueskyson1401@gmail.com>
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# readonly
> Create or modify read-only variables within a shell script, preventing the variable from being changed by subsequent commands.
> This is useful when you want to ensure that a variable retains a constant value throughout the execution of a script.
> More information: <https://manned.org/readonly.1p>.
- Create a read-only variable:
`readonly {{variable_name}}={{value}}`
- Mark a variable as read-only:
`readonly {{existing_variable}}`
- [p]rint to the standard output the names and values of all read-only variables:
`readonly -p`