readonly

Mark one or more variables or functions as read-only.

Syntax
      readonly [-apf] [name[=word] ...]

Key
   -a   Treat each name as an array variable.

   -p   Print a list of all readonly names (This is the default)

   -f   Mark shell functions corresponding to the names as read-only.

The given names are marked readonly and the values of these names can not be changed by subsequent assignment.

If the -f option is given, then functions corresponding to the names are so marked.

If no arguments are given, or if '-p' is given, a list of all readonly names is printed.

The '-a' option means to treat each name as an array variable.

An argument of '--' disables further option processing.

If a variable name is followed by =word, the value of the variable is set to word.

The return status is 0 unless an invalid option is encountered, one of the names is not a valid shell variable name, or -f is supplied with a name that is not a function.

This is a BASH shell builtin, to display your local syntax from the bash prompt type: help [r]eadonly

“The universe is like a safe to which there is a combination. But the combination is locked up in the safe” ~ Peter De Vries

Related macOS commands:

set - Set a shell variable = value


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