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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:

  • 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