# LibTmux::Server.environment-session-id

- **Module:** LibTmux
- **Package:** LibTmux
- **Language:** Raku
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-raku/blob/e76160bcce6e03976d49424da15b7c31afb2c68e/lib/LibTmux/Server.rakumod#L272
- **Page:** https://libtmux.org/en/raku/latest/reference/libtmux-server-environment-session-id/

Session ID explicitly imported from TMUX; undefined when tmux supplied -1.

Session ID explicitly imported from TMUX; undefined when tmux supplied -1.