# LibTmux::Server.has-session

- **Module:** LibTmux
- **Package:** LibTmux
- **Language:** Raku
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-raku/blob/e76160bcce6e03976d49424da15b7c31afb2c68e/lib/LibTmux/Server.rakumod#L440
- **Page:** https://libtmux.org/en/raku/latest/reference/libtmux-server-has-session/

```
method has-session(Mu :$id = SessionId, Mu :$name = Str --> Bool:D)
```

Test one exact session ID or name. Acquisition and identity failures still throw.

Test one exact session ID or name. Acquisition and identity failures still throw.

## Parameters

- `$id?` (`Mu`)
- `$name?` (`Mu`)

## tmux command

The tmux commands behind `has-session`.

- [`list-sessions`](/en/tmux/latest/manual/list-sessions/)

## tmux C API

The C declarations in tmux that implement these commands.

- [`cmd_list_sessions_entry`](/en/tmux/latest/reference/c-variable-cmd_list_sessions_entry/) (attribute)
- [`cmd_list_sessions_exec`](/en/tmux/latest/reference/c-function-cmd-list-sessions-c-cmd_list_sessions_exec/) (function)

## In other ports

Whether a session with this name exists

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Server.has_session`](/en/py/latest/reference/libtmux-server-has_session/) (method) |
| Haskell | No public Haskell equivalent is implemented; the current modules expose scalar values and version parsing. |
| TypeScript | [`server.Server.hasSession`](/en/ts/latest/reference/server-server-hassession/) (method) |
| Rust | [`server.Server.has_session`](/en/rs/latest/reference/server-server-has_session/) (method) |
| Go | [`tmux.Server.HasSession`](/en/go/latest/reference/tmux-server-hassession/) (method) |
| Java | [`io.github.libtmux.Server.hasSession`](/en/java/latest/reference/io-github-libtmux-server-server-hassession/) (method) |
| C# | [`LibTmux.Server.HasSessionAsync`](/en/csharp/latest/reference/libtmux-server-hassessionasync/) (method) |
| C++ | no equivalent on `Server` |
| Swift | [`Server.hasSession(_:)`](/en/swift/latest/reference/server-hassession(_-)/) (method) |
| OCaml | No direct public OCaml equivalent is recorded for this operation. |
| Perl | No dedicated equivalent in the selected Perl surface. Explicit Server::cmd remains available for native tmux commands. |

No equivalent is recorded in Ruby, Lua, PowerShell, Julia, Erlang, Elixir, Common Lisp, Clojure, Kotlin, Scala or F#.