A Rust equivalent of Unix command "which". Locate installed executable in cross platforms.

• Linux
• Windows
• macOS

1. To find which rustc executable binary is using.

   use which::which;
   
   let result = which("rustc").unwrap();
   assert_eq!(result, PathBuf::from("/usr/bin/rustc"));

2. After enabling the regex feature, find all cargo subcommand executables on the path:

   use which::which_re;
   
   which_re(Regex::new("^cargo-.*").unwrap()).unwrap()
       .for_each(|pth| println!("{}", pth.to_string_lossy()));

This crate currently has an MSRV of Rust 1.70. Increasing the MSRV is considered a breaking change and thus requires a major version bump.

We cannot make any guarantees about the MSRV of our dependencies. You may be required to pin one of our dependencies to a lower version in your own Cargo.toml in order to compile with the minimum supported Rust version. Eventually Cargo will handle this automatically. See rust-lang/cargo#9930 for more.

The documentation is available online.