grunt-task.js

module.exports = function(grunt) {
  grunt.registerMultiTask("filecount", "Count how many files were passed to the task", function() {
    var fileCount = this.filesSrc.length;
    
    if(grunt.option("verbose")) {
      this.filesSrc.each(function(filePath) {
        grunt.verbose.writeln(filePath);
      });
    }
    
    grunt.log(">> " + fileCount + " files.");
  });
};

Gruntfile.basic.js

module.exports = function(grunt) {
  var cfg = {
    jshint2: {
      options: {
        jshint: {
          node: true,
          unused: true,
          undef: true
        }
      },
      
      all: ["lib/**/*.js"]
    }
  };
  
  grunt.initConfig(cfg);
  
  // Assumes you have: npm install grunt-jshint2 --save-dev
  grunt.loadNpmTasks("grunt-jshint2");
  
  grunt.registerTask("default", ["jshint2:all"]);
};