tldr/pages/common/readonly.md

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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 the names and values of all read-only variables to `stdout`:
`readonly -p`