Run WASM Module as Executable

// hello.rs
fn main() {
    println!("Hello, world!");
}

rustup target add wasm32-wasi
rustc hello.rs --target wasm32-wasi
wasmtime hello.wasm
> Hello, world!

rustup target add wasm32-wasi
cargo build --target wasm32-wasi    # build main.rs into wasm32-wasi

# run the program
echo "hello world!" > a.txt # construct a example file
wasmtime --dir=. target/wasm32-wasi/debug/wasm-tut.wasm a.txt b.txt  # run the wasm module, give cwd permission with --dir=.
wasmer --dir=. target/wasm32-wasi/debug/wasm-tut.wasm a.txt b.txt # wasmer can also be used to run the module