unfunction

Remove a shell function

$ unfunction [function_name]

$ unfunction [function1] [function2]

$ unfunction -m "[pattern]*"

unfunction [-m] name [name ...]

unfunction is a zsh builtin that removes the definition of one or more shell functions from the current session. After removal, calling the function name will result in a "command not found" error unless an external command or alias with the same name exists.
This is the zsh equivalent of unset -f in bash and is useful for cleaning up function definitions, reloading modified function files, or undoing autoloaded functions.

-m

Treat arguments as patterns and remove all matching functions

Only available in zsh. In bash, use unset -f instead. The removal only affects the current shell session and does not modify function definition files. Removing autoloaded functions allows them to be re-autoloaded on next use if the autoload registration is still active.

unfunction was introduced in zsh as a dedicated command for function removal, complementing the autoload and function definition mechanisms in the Z Shell.

autoload(1), unset(1), zsh(1)