The manpage for `nix build` & `nix shell` goes to `nix-build` & `nix-shell` the stable, non-experimental command which do not need a file as an arg since they are more developer-friendly. The `nix-command` experimental stuff is documented somewhere else—maybe https://nix.dev/manual/nix/2.35/command-ref/new-cli/nix.html... is good enough for the concept. `man nixos-rebuild`, `man nix profile` have `--file, -F` documented.
It’s interesting because in an ideal world he is practically building a NixOS config.
I’m pretty new to NixOS (a few months) but i could envision using Nix to declarativey configure tmux windows and panes in a dev shell. That said, Nix feels like it might still be too clunky at this point in time to quickly re-declare window and panel arrangements. But I never tried and it could be possible.
https://github.com/richlegrand/bitbang-cli