exec 0.3.1

Use the POSIX exec function to replace the running program with another
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exec: A Rust library to replace the running program with another

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This is a simple Rust wrapper around execvp. It can be used as follows:

let err = exec::Command::new("echo")
    .arg("hello").arg("world")
    .exec();
println!("Error: {}", err);

Note that if exec returns, it will always return an error. There's also a lower-level exec::execvp function if you need to use it.