# tmux_option:write_options/0

- **Package:** libtmux_erlang
- **Language:** Erlang
- **Kind:** typealias
- **Source:** https://github.com/libtmux/libtmux-erlang/blob/d1b6308440cf9eb8f6647e7ae434bce60e849368/apps/libtmux_erlang/src/tmux_option.erl#L52
- **Page:** https://libtmux.org/en/erlang/latest/reference/t-tmux_option-write_options-0/

```
-type write_options() ::
          #{append => boolean(),
            only_if_unset => boolean()}.
```

append maps to -a; only_if_unset maps to -o and reports already-set errors. Both default false.