## Installing Binaries from Crates.io with `cargo install`

The `cargo install` command allows you to install and use binary crates locally. This isn’t intended to replace system packages; it’s meant to be a convenient way for Rust developers to install tools that others have shared on crates.io. Note that you can only install packages that have binary targets. A binary target is the runnable program that is created if the crate has a src/main.rs file or another file specified as a binary, as opposed to a library target that isn’t runnable on its own but is suitable for including within other programs. Usually, crates have information in the README file about whether a crate is a library, has a binary target, or both.

All binaries installed with `cargo install` are stored in the installation root’s bin folder. If you installed Rust using rustup.rs and don’t have any custom configurations, this directory will be $HOME/.cargo/bin. Ensure that directory is in your `$PATH` to be able to run programs you’ve installed with `cargo install`.

For example, in Chapter 12 we mentioned that there’s a Rust implementation of the `grep` tool called `ripgrep` for searching files. If we want to install `ripgrep`, we can run the following:

    $ cargo install ripgrep
    Updating registry `https://github.com/rust-lang/crates.io-index`
     Downloading ripgrep v0.3.2
     --snip--
       Compiling ripgrep v0.3.2
        Finished release [optimized + debuginfo] target(s) in 97.91 secs
      Installing ~/.cargo/bin/rg

The last line of the output shows the location and the name of the installed binary, which in the case of `ripgrep` is `rg`. As long as the installation directory is in your `$PATH`, as mentioned previously, you can then run `rg --help` and start using a faster, rustier tool for searching files!