# tmux_option:unset/2

- **Package:** libtmux_erlang
- **Language:** Erlang
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-erlang/blob/d1b6308440cf9eb8f6647e7ae434bce60e849368/apps/libtmux_erlang/src/tmux_option.erl#L198
- **Page:** https://libtmux.org/en/erlang/latest/reference/tmux_option-unset-2/

```
unset(Scope, Key)
-spec unset(scope(), key()) ->
               {ok, tmux_operation:completed()} |
               {error, tmux_operation:failure()}.
```

Remove a local option or one indexed entry. Removing a local option restores inheritance; removing an entry leaves a local array, possibly empty. Unsetting a global built-in resets tmux's default; user options are removed. Missing local values are a successful tmux no-op. No pane-wide -U action is implied. Performs I/O and returns the command result without refreshing captured rows.

## Parameters

- `Scope` (`scope()`)
- `Key` (`key()`)

## tmux command

The tmux commands behind `unset/2`.

- [`set-option`](/en/tmux/latest/manual/set-option/)

## tmux C API

The C declarations in tmux that implement these commands.

- [`cmd_set_option_entry`](/en/tmux/latest/reference/c-variable-cmd_set_option_entry/) (attribute)
- [`cmd_set_option_exec`](/en/tmux/latest/reference/c-function-cmd-set-option-c-cmd_set_option_exec/) (function)