It might be nice to add a CLI version of the commands. This would allow people to use the commands directly inside the package.json.

For example:

   …
    "scripts": {
        "copy": "shelljs cp source/* desk"
    }
    …

This would make the cp task available which then could be used in every operating system, no matter if it is included or not.

Right now I would need to add a separate tool for each job (for example cpy).