Run Unix commands using PuTTY in C# [duplicate]

Question

I am trying to run Unix commands in PuTTY using C#. I have the below code. But the code is not working. I am not able to open PuTTY.

static void Main(string[] args)
{
    Process cmd = new Process();
    cmd.StartInfo.FileName = @"C:\Windows\System32\cmd";
    cmd.StartInfo.UseShellExecute = false;
    cmd.StartInfo.RedirectStandardInput = false;
    cmd.StartInfo.RedirectStandardOutput = true;
    cmd.Start();
    cmd.StartInfo.Arguments = "C:\Users\win7\Desktop\putty.exe -ssh [email protected] 22 -pw mahi";
}

You've gone a bit wrong there mate. Have a look at stackoverflow.com/questions/6147203/… — Tony Hopkinson
– Tony Hopkinson, Commented Dec 21, 2014 at 18:28

Martin Prikryl · Accepted Answer · 2021-11-10 08:29:17Z

First, in general, you better use native .NET SSH library, like SSH.NET, instead of running external application.

See How to run commands on SSH server in C#?

The putty.exe is a GUI application. It's intended to interactive use, not for automation. There's no point trying to redirect its standard output, as it's not using it.
For automation, use another tool from PuTTY package, the plink.exe.
It's a console application, so you can redirect its standard output/input.
There's no point trying to execute an application indirectly via the cmd.exe. Execute it directly.
You need to redirect standard input too, to be able to feed commands to the Plink.
You have to provide arguments before calling the .Start().
You may want to redirect error output too (the RedirectStandardError). Though note that you will need to read output and error output in parallel, what complicates the code.

static void Main(string[] args)
{
    Process cmd = new Process();
    cmd.StartInfo.FileName = @"C:\Program Files (x86)\PuTTY\plink.exe";
    cmd.StartInfo.UseShellExecute = false;
    cmd.StartInfo.RedirectStandardInput = true;
    cmd.StartInfo.RedirectStandardOutput = true;
    cmd.StartInfo.Arguments = "-ssh [email protected] 22 -pw mahi";
    cmd.Start();
    cmd.StandardInput.WriteLine("./myscript.sh");
    cmd.StandardInput.WriteLine("exit");
    string output = cmd.StandardOutput.ReadToEnd();
}

Grady G Cooper · Accepted Answer · 2014-12-21 21:05:25Z

2

This should work:

    static void Main(string[] args)
    {
        ProcessStartInfo cmd = new ProcessStartInfo();
        cmd.FileName = @"C:\Users\win7\Desktop\putty.exe";
        cmd.UseShellExecute = false;
        cmd.RedirectStandardInput = false;
        cmd.RedirectStandardOutput = true;
        cmd.Arguments = "-ssh [email protected] 22 -pw mahi";
        using (Process process = Process.Start(cmd))
        {
            process.WaitForExit();
        }
    }

edited Dec 21, 2014 at 21:05

answered Dec 21, 2014 at 18:31

Grady G Cooper

1,0748 silver badges20 bronze badges

2 Comments

Martin Prikryl Over a year ago

While the code indeed executes PuTTY, how does it allow you to execute commands?

Grady G Cooper Over a year ago

If you want to run commands, I'd recommend using an SSH library like SSH.NET versus using putty.

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