Unityからコマンドプロンプトを起動するスクリプト.

CMD.cs

using UnityEditor;

public static class CMD
{
    [MenuItem("CMD/Debug/EchoTEST")]
    public static void EchoTEST()
    {
        Call("/k echo TEST", false);
    }

    private static void Call(string cmd, bool isHide = true)
    {
        System.Diagnostics.Process process = new System.Diagnostics.Process();
        System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
        if(isHide) startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
        startInfo.FileName = "cmd.exe";
        startInfo.Arguments = cmd;
        process.StartInfo = startInfo;
        process.Start();
        process.WaitForExit();
    }
}