# extended-keys-format

Source: https://libtmux.org/en/tmux/latest/catalog/options/extended-keys-format/

> Selects one of the two possible formats for reporting modified keys to applications.

option tmux3.7c

Selects one of the two possible formats for reporting modified keys to applications.

* Scope

  server

* Type

  Choice

* Default

  `xterm`

* Values

  `csi-u` `xterm`

* Set

  [`set-option`](https://libtmux.org/en/tmux/latest/manual/set-option/) `-s extended-keys-format value`

* Read

  [`show-options`](https://libtmux.org/en/tmux/latest/manual/show-options/) `-s extended-keys-format`

## Description[#](https://libtmux.org/en/tmux/latest/catalog/options/extended-keys-format/#description)

Selects one of the two possible formats for reporting modified keys to applications. This is the equivalent of the `formatOtherKeys`[xterm(1)]() resource. For example, C-S-a will be reported as ‘`^[[27;6;65~`’ when set to `xterm`, and as ‘`^[[65;6u`’ when set to `csi-u`.

## Releases[#](https://libtmux.org/en/tmux/latest/catalog/options/extended-keys-format/#releases)

* [tmux 3.7c](https://libtmux.org/en/tmux/3.7c/catalog/options/extended-keys-format/) : present
* tmux 3.2a : not present

## Source[#](https://libtmux.org/en/tmux/latest/catalog/options/extended-keys-format/#source)

* Defined in

  [`options-table.c:399`](https://github.com/tmux/tmux/blob/e476c1230b958df0cb12977517d24b3dc931375b/options-table.c#L399)

* C source reference

  [`options_table`](https://libtmux.org/en/tmux/latest/reference/c-variable-options_table/)

* CLI Manual

  [Original manual entry](https://libtmux.org/en/tmux/latest/manual/full/#options-extended-keys-format)

## Used by[#](https://libtmux.org/en/tmux/latest/catalog/options/extended-keys-format/#used-by)

Library documentation that names this option.

* Rust

  [`options.generated.EXTENDED_KEYS_FORMAT`](https://libtmux.org/en/rs/latest/reference/options-generated-extended_keys_format/)

* Go

  [`tmux.ExtendedKeysFormat`](https://libtmux.org/en/go/latest/reference/tmux-extendedkeysformat/), [`tmux.Server.SetExtendedKeysFormat`](https://libtmux.org/en/go/latest/reference/tmux-server-setextendedkeysformat/), [`tmux.ServerOptionValues.ExtendedKeysFormat`](https://libtmux.org/en/go/latest/reference/tmux-serveroptionvalues-extendedkeysformat/)