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# readonly
> Set read-only shell variables.
> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-readonly>.
- Set 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`