# Libtmux_eio.Client.create_session

- **Module:** Libtmux_eio
- **Package:** libtmux-eio
- **Language:** OCaml
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-ocaml/blob/205dfda49742592b479247049d186956e4a4cfe9/eio/libtmux_eio.mli#L412
- **Public owner:** Libtmux_eio
- **Page:** https://libtmux.org/en/ocaml/latest/reference/libtmux_eio-client-create_session/

```
val create_session :
  ?window_name:string ->
  ?width:int ->
  ?height:int ->
  ?spawn:Libtmux.Spawn.t ->
  t -> name:string -> unit -> (Libtmux.Created.t, Libtmux.Error.t) result
```

Create a detached session on the bound daemon. Name collisions fail.

## Parameters

- `window_name?` (`string`)
- `width?` (`int`)
- `height?` (`int`)
- `spawn?` (`Libtmux.Spawn.t`)
- `arg1` (`t`)
- `name` (`string`)
- `arg2` (`unit`)

## tmux command

The tmux commands behind `create_session`.

- [`new-session`](/en/tmux/latest/manual/new-session/)

## tmux C API

The C declarations in tmux that implement these commands.

- [`cmd_new_session_entry`](/en/tmux/latest/reference/c-variable-cmd_new_session_entry/) (attribute)
- [`cmd_new_session_exec`](/en/tmux/latest/reference/c-function-cmd-new-session-c-cmd_new_session_exec/) (function)

Each path starts at a function a command runs, which is degree 1. The degree counts steps from there along the path, and each step is a call or a reference: degree 2 is reached from that function, degree 3 from the next, and so on.

### Create a session and its first pane

1. [`cmd_new_session_exec`](/en/tmux/latest/reference/c-function-cmd-new-session-c-cmd_new_session_exec/) (function)
2. calls → [`spawn_window`](/en/tmux/latest/reference/c-function-spawn_window/) (function)
3. calls → [`spawn_pane`](/en/tmux/latest/reference/c-function-spawn_pane/) (function)
4. calls → [`window_add_pane`](/en/tmux/latest/reference/c-function-window_add_pane/) (function)
5. calls → [`window_pane_create`](/en/tmux/latest/reference/c-function-window-c-window_pane_create/) (function)

## In other ports

Create a session

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Server.new_session`](/en/py/latest/reference/libtmux-server-new_session/) (method) |
| Ruby | [`LibTmux::Server#new_session`](/en/ruby/latest/reference/libtmux-server-new_session/) (method) |
| Lua | [`libtmux.Server:new_session`](/en/lua/latest/reference/libtmux-server-new_session/) (method) |
| Erlang | [`tmux_session:create/2`](/en/erlang/latest/reference/tmux_session-create-2/) (function) |
| Haskell | No public Haskell equivalent is implemented; the current modules expose scalar values and version parsing. |
| TypeScript | [`server.Server.newSession`](/en/ts/latest/reference/server-server-newsession/) (method) |
| Rust | [`server.Server.new_session`](/en/rs/latest/reference/server-server-new_session/) (method) |
| Go | [`tmux.Server.NewSession`](/en/go/latest/reference/tmux-server-newsession/) (method) |
| Java | [`io.github.libtmux.Server.newSession`](/en/java/latest/reference/io-github-libtmux-server-server-newsession/) (method) |
| Clojure | [`libtmux.core/new-session!`](/en/clojure/latest/reference/libtmux-core-new-session/) (function) |
| Kotlin | [`io.github.libtmux.kotlin.Server.newSession`](/en/kotlin/latest/reference/io-github-libtmux-kotlin-server-newsession/) (method) |
| Scala | [`io.github.libtmux.scaladsl.Server.newSession`](/en/scala/latest/reference/io-github-libtmux-scaladsl-server-newsession/) (method) |
| C# | [`LibTmux.Server.CreateSessionAsync`](/en/csharp/latest/reference/libtmux-server-createsessionasync/) (method) |
| C++ | [`libtmux::Server::new_session`](/en/cxx/latest/reference/libtmux-server-new_session/) (method) |
| Swift | [`Server.newSession(named:startDirectory:windowName:width:height:environment:shell:)`](/en/swift/latest/reference/server-newsession(named-startdirectory-windowname-width-height-)/) (method) |
| Perl | [`LibTmux::Server::new_session`](/en/perl/latest/reference/libtmux-server-new_session/) (method). Explicit Server operation. Captured entities remain local observations; use a new snapshot to observe changes. |

No equivalent is recorded in PowerShell, Julia, Elixir, Common Lisp or F#.