# libtmux::SplitOptions::environment

- **Module:** libtmux::SplitOptions
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/entities.hpp#L97
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-splitoptions-environment/

Variables the new process starts with, on top of what tmux passes down.

Pairs rather than `NAME=value` strings: tmux takes a `-e` without an `=` without complaint and creates nothing, so the pair is joined here and a name carrying an `=` is refused where the command is built.

An empty value sets the variable to empty. It does not remove it.