A Unity3d editor script used to perform generic builds from the command line.

Build.cs

using System;
using System.Collections.Generic;
using UnityEditor;

public class Build {
    static string[] SCENES = FindEnabledEditorScenes();

    static void PerformBuild() {
        GenericBuild(
            SCENES,
            GetArg("-targetPath"),
            (BuildTarget) Enum.Parse(typeof (BuildTarget), GetArg("-buildTarget")),
            (BuildOptions) Enum.Parse(typeof (BuildOptions), GetArg("-buildOptions") ?? "None"));
    }

	private static string[] FindEnabledEditorScenes() {
		List<string> EditorScenes = new List<string>();
		foreach(EditorBuildSettingsScene scene in EditorBuildSettings.scenes) {
			if (!scene.enabled) continue;
			EditorScenes.Add(scene.path);
		}
		return EditorScenes.ToArray();
	}

    static void GenericBuild(string[] scenes, string target_dir, BuildTarget build_target, BuildOptions build_options) {
        EditorUserBuildSettings.SwitchActiveBuildTarget(build_target);
        string res = BuildPipeline.BuildPlayer(scenes,target_dir,build_target,build_options);
        if (res.Length > 0) {
                throw new Exception("BuildPlayer failure: " + res);
        }
    }

    // Helper function for getting the command line arguments
    // Taken from: https://effectiveunity.com/articles/making-most-of-unitys-command-line.html
    private static string GetArg(string name)
    {
        var args = System.Environment.GetCommandLineArgs();
        for (int i = 0; i < args.Length; i++)
        {
            if (args[i] == name && args.Length > i + 1)
            {
                return args[i + 1];
            }
        }
        return null;
    }
}