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# Command Line Usage
Install the `bindgen` executable with `cargo`:
```bash
$ cargo install bindgen-cli
```
The `bindgen` executable is installed to `~/.cargo/bin`. You have to add that
directory to your `$PATH` to use `bindgen`.
`bindgen` takes the path to an input C or C++ header file, and optionally an
output file path for the generated bindings. If the output file path is not
supplied, the bindings are printed to `stdout`.
If we wanted to generated Rust FFI bindings from a C header named `input.h` and
put them in the `bindings.rs` file, we would invoke `bindgen` like this:
```bash
$ bindgen input.h -o bindings.rs
```
For more details, pass the `--help` flag:
```bash
$ bindgen --help
```
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