ShellJS is awesome. It's basically Unix shell commands for Node.js, which is excellent if you want to write a makefile equivalent in JavaScript.
If, on the other hand, you want to execute web developer-centric tasks like concatenation and minification, linting, running of unit tests in pure JavaScript or a headless WebKit instance, or any of the functionality the 90+ plugins I'm aware of provide, check grunt out.
Grunt also works on all platforms, and supports completely arbitrary JavaScript tasks. If you can write it, grunt will execute it.
And because grunt supports arbitrary JavaScript tasks, you can use ShellJS (or any other JavaScript) from within grunt.
If, on the other hand, you want to execute web developer-centric tasks like concatenation and minification, linting, running of unit tests in pure JavaScript or a headless WebKit instance, or any of the functionality the 90+ plugins I'm aware of provide, check grunt out.
Grunt also works on all platforms, and supports completely arbitrary JavaScript tasks. If you can write it, grunt will execute it.
And because grunt supports arbitrary JavaScript tasks, you can use ShellJS (or any other JavaScript) from within grunt.