# Libtmux_eio.Client.unset_environment

- **Module:** Libtmux_eio
- **Package:** libtmux-eio
- **Language:** OCaml
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-ocaml/blob/205dfda49742592b479247049d186956e4a4cfe9/eio/libtmux_eio.mli#L306
- **Public owner:** Libtmux_eio
- **Page:** https://libtmux.org/en/ocaml/latest/reference/libtmux_eio-client-unset_environment/

```
val unset_environment :
  t -> Libtmux.Environment.scope -> string -> (unit, Libtmux.Error.t) result
```

Remove the local entry, allowing a global value to apply to future panes.

## Parameters

- `arg1` (`t`)
- `arg2` (`Libtmux.Environment.scope`)
- `arg3` (`string`)

## tmux command

The tmux commands behind `unset_environment`.

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

## tmux C API

The C declarations in tmux that implement these commands.

- [`cmd_set_environment_entry`](/en/tmux/latest/reference/c-variable-cmd_set_environment_entry/) (attribute)
- [`cmd_set_environment_exec`](/en/tmux/latest/reference/c-function-cmd-set-environment-c-cmd_set_environment_exec/) (function)

## In other ports

Unset a variable in the server's environment

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Server.unset_environment`](/en/py/latest/reference/libtmux-server-unset_environment/) (method) |
| Ruby | [`LibTmux::Server#unset_environment`](/en/ruby/latest/reference/libtmux-server-unset_environment/) (method) |
| Lua | [`libtmux.Server:unset_environment`](/en/lua/latest/reference/libtmux-server-unset_environment/) (method) |
| Haskell | No public Haskell equivalent is implemented; the current modules expose scalar values and version parsing. |
| TypeScript | [`server.Server.unsetEnvironment`](/en/ts/latest/reference/server-server-unsetenvironment/) (method) |
| Rust | [`server.Server.unset_environment`](/en/rs/latest/reference/server-server-unset_environment/) (method) |
| Go | [`tmux.Server.UnsetEnvironment`](/en/go/latest/reference/tmux-server-unsetenvironment/) (method) |
| Java | no equivalent on `Server` |
| C# | no equivalent on `Server` |
| C++ | no equivalent on `Server` |
| Swift | [`Server.unsetEnvironment(_:in:)`](/en/swift/latest/reference/server-unsetenvironment(_-in-)/) (method) |
| Perl | [`LibTmux::Server::unset_environment`](/en/perl/latest/reference/libtmux-server-unset_environment/) (method). Omit session for the global environment. Missing or explicitly unset values remain failures. |

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

Unset a variable in a session's environment

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Session.unset_environment`](/en/py/latest/reference/libtmux-session-unset_environment/) (method) |
| Ruby | [`LibTmux::Session#unset_environment`](/en/ruby/latest/reference/libtmux-session-unset_environment/) (method) |
| Lua | [`libtmux.Session:unset_environment`](/en/lua/latest/reference/libtmux-session-unset_environment/) (method) |
| Haskell | No public Haskell equivalent is implemented; the current modules expose scalar values and version parsing. |
| TypeScript | [`session.Session.unsetEnvironment`](/en/ts/latest/reference/session-session-unsetenvironment/) (method) |
| Rust | [`session.Session.unset_environment`](/en/rs/latest/reference/session-session-unset_environment/) (method) |
| Go | [`tmux.Session.UnsetEnvironment`](/en/go/latest/reference/tmux-session-unsetenvironment/) (method) |
| Java | no equivalent on `Session` |
| C# | no equivalent on `Session` |
| C++ | no equivalent on `Session` |
| Swift | [`Server.unsetEnvironment(_:in:)`](/en/swift/latest/reference/server-unsetenvironment(_-in-)/) (method) |
| Perl | [`LibTmux::Server::unset_environment`](/en/perl/latest/reference/libtmux-server-unset_environment/) (method). Pass an explicit session ID. Empty text and zero-like text remain values. |

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