tldr/pages/common/readonly.md

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