Chapter 10, 10.18, ch10-render-hex, Mac OS X

[zanayr]

The book has the following input for the ch10-render-hex project

$ cargo run -- $(
>   echo 'Rust in Action' |
>   sha1sum |
>   cut -f1 -d' '
> )

However on Mac OS X, the tool is shasum and not sha1sum, and works great with the following input

$ cargo run -- $(
>   echo 'Rust in Action' |
>   shasum |
>   cut -f1 -d' '
> )

Just thought I should share for the author or anyone else searching for why they're getting "Opps, all Noops!" in their cereal box.

Very cool project, and great book. Thanks!