# LibTmux::Server#set_environment

- **Module:** LibTmux
- **Package:** libtmux
- **Language:** Ruby
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ruby/blob/dcc9f8b5a6970144a9e7d80cd5f381d8f6198372/gems/libtmux/lib/libtmux/operations.rb#L81
- **Page:** https://libtmux.org/en/ruby/v0.1.0.alpha.2/reference/libtmux-server-set_environment/

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

Behavior: Environment.

Behavior contract: Environment.

## In other ports

### Set a variable in the server's environment

- Python: [`libtmux.Server.set_environment`](/en/py/latest/reference/libtmux-server-set_environment/) (method)
- Lua: [`libtmux.Server:set_environment`](/en/lua/latest/reference/libtmux-server-set_environment/) (method)
- TypeScript: [`server.Server.setEnvironment`](/en/ts/latest/reference/server-server-setenvironment/) (method)
- Rust: [`server.Server.set_environment`](/en/rs/latest/reference/server-server-set_environment/) (method)
- Go: [`tmux.Server.SetEnvironment`](/en/go/latest/reference/tmux-server-setenvironment/) (method)
- Swift: [`Server.setEnvironment(_:to:in:)`](/en/swift/latest/reference/server-setenvironment(_-to-in-)/) (method)