的过程.在MAC OS中使用.net core启动时给出错误-没有这样的文件或目录

我正在创建一个。net核心控制台应用程序来运行命令。

public bool RunCommand()
{
    try
    {
        var procStartInfo = new ProcessStartInfo("exec", "cal")
        {
            RedirectStandardOutput = true,
            UseShellExecute = false,
            CreateNoWindow = false
        };
        var proc = new Process { StartInfo = procStartInfo };
        proc.Start();
        // Get the output into a string
        output = proc.StandardOutput.ReadToEnd();
        return proc.ExitCode == decimal.Zero ? true : false;
    }
    finally
    {
        // do something
    }
}

我得到以下错误-

Unhandled Exception: System.ComponentModel.Win32Exception: No such file or directory
   at System.Diagnostics.Process.ResolvePath(String filename)
   at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start()
   at HockeyApp.Enablers.IosCodeSign.ProcessManager.RunCommand(String command, String& output)
   at HockeyApp.Enablers.IosCodeSign.Program.Main(String[] args)

我甚至试过-

var procStartInfo = new ProcessStartInfo("cal")

没有运气。