# libtmux::Server::check_file

- **Module:** libtmux::Server
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/85e8bd603a322dc32bb8b9aeb1a72bcf36945f1d/include/libtmux/server.hpp#L269
- **Page:** https://libtmux.org/reference/cxx/libtmux-server-check_file/

```
libtmux::Server::check_file(file: const std::filesystem::path &) -> expected< void, CommandFailure >
```

Parse the same file and report what tmux would refuse in it, running none of it.

This is how a program checks a configuration it is about to apply without applying half of it first.