# Libtmux_eio.Client.capture_environment

- **Module:** Libtmux_eio
- **Package:** libtmux-eio
- **Language:** OCaml
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-ocaml/blob/205dfda49742592b479247049d186956e4a4cfe9/eio/libtmux_eio.mli#L285
- **Public owner:** Libtmux_eio
- **Page:** https://libtmux.org/en/ocaml/latest/reference/libtmux_eio-client-capture_environment/

```
val capture_environment :
  ?hidden:bool ->
  t ->
  Libtmux.Environment.scope ->
  (Libtmux.Environment.t, Libtmux.Error.t) result
```

Acquire a bounded table through a read-only command process. Its response must identify the bound daemon while the original pidfd remains live. Unsupported external variable names fail decoding; they are not omitted.

## Parameters

- `hidden?` (`bool`)
- `arg1` (`t`)
- `arg2` (`Libtmux.Environment.scope`)

## tmux command

The tmux commands behind `capture_environment`.

- [`show-environment`](/en/tmux/latest/manual/show-environment/)

## tmux C API

The C declarations in tmux that implement these commands.

- [`cmd_show_environment_entry`](/en/tmux/latest/reference/c-variable-cmd_show_environment_entry/) (attribute)
- [`cmd_show_environment_exec`](/en/tmux/latest/reference/c-function-cmd-show-environment-c-cmd_show_environment_exec/) (function)

## In other ports

Read the server's global environment

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Server.show_environment`](/en/py/latest/reference/libtmux-server-show_environment/) (method) |
| Ruby | [`LibTmux::Server#environment`](/en/ruby/latest/reference/libtmux-server-environment/) (method) |
| Lua | [`libtmux.Server:list_environment`](/en/lua/latest/reference/libtmux-server-list_environment/) (method) |
| Haskell | No public Haskell equivalent is implemented; the current modules expose scalar values and version parsing. |
| TypeScript | [`server.Server.showEnvironment`](/en/ts/latest/reference/server-server-showenvironment/) (method) |
| Rust | [`server.Server.environment`](/en/rs/latest/reference/server-server-environment/) (method) |
| Go | [`tmux.Server.ShowEnvironment`](/en/go/latest/reference/tmux-server-showenvironment/) (method) |
| Java | no equivalent on `Server` |
| C# | [`LibTmux.Server.Environment`](/en/csharp/latest/reference/libtmux-server-environment/) (property) |
| C++ | no equivalent on `Server` |
| Swift | [`Server.environment(_:)`](/en/swift/latest/reference/server-environment(_-)/) (method) |
| Perl | No dedicated equivalent in the selected Perl surface. Explicit Server::cmd remains available for native tmux commands. |

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

Read a session's environment

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Session.show_environment`](/en/py/latest/reference/libtmux-session-show_environment/) (method) |
| Ruby | [`LibTmux::Session#environment`](/en/ruby/latest/reference/libtmux-session-environment/) (method) |
| Lua | [`libtmux.Session:list_environment`](/en/lua/latest/reference/libtmux-session-list_environment/) (method) |
| Haskell | No public Haskell equivalent is implemented; the current modules expose scalar values and version parsing. |
| TypeScript | [`session.Session.showEnvironment`](/en/ts/latest/reference/session-session-showenvironment/) (method) |
| Rust | [`session.Session.environment`](/en/rs/latest/reference/session-session-environment/) (method) |
| Go | [`tmux.Session.ShowEnvironment`](/en/go/latest/reference/tmux-session-showenvironment/) (method) |
| Java | no equivalent on `Session` |
| C# | [`LibTmux.Session.Environment`](/en/csharp/latest/reference/libtmux-session-environment/) (property) |
| C++ | no equivalent on `Session` |
| Swift | [`Server.environment(_:)`](/en/swift/latest/reference/server-environment(_-)/) (method) |
| Perl | No dedicated equivalent in the selected Perl surface. Explicit Server::cmd remains available for native tmux commands. |

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