# LibTmux::Session#environment

- **Module:** LibTmux
- **Package:** libtmux
- **Language:** Ruby
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ruby/blob/d8ce4bbee0ca7748a81929f81f7d8d07f8c51267/gems/libtmux/lib/libtmux/operations.rb#L279
- **Page:** https://libtmux.org/en/ruby/v0.1.0.alpha.3/reference/libtmux-session-environment/

```
def environment: (
  ::String,
  ?hidden: bool,
  ?timeout: ::Numeric,
  ?cancel: untyped
) -> ::String?
```

Behavior: Environment.

Behavior contract: Environment.

## Parameters

- `arg1` (`::String`)
- `hidden` (`bool`)
- `timeout` (`::Numeric`)
- `cancel` (`untyped`)

## In other ports

### Read a session's environment

- Python: [`libtmux.Session.show_environment`](/en/py/latest/reference/libtmux-session-show_environment/) (method)
- Lua: [`libtmux.Session:list_environment`](/en/lua/latest/reference/libtmux-session-list_environment/) (method)
- 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)
- C#: [`LibTmux.Session.Environment`](/en/csharp/latest/reference/libtmux-session-environment/) (property)
- Swift: [`Server.environment(_:)`](/en/swift/latest/reference/server-environment(_-)/) (method)