New Post: How to deal with the error stream when using ShellStream

When I use ShellStream to get the output like putty or plink,i have some questions.
First,I can get the stdout correctly by using following codes.

            ShellStream shells = client.CreateShellStream("test", 80, 24, 800, 600, 1024);
            string input = "ping 127.0.0.1 -c 10";
            shells.WriteLine(input);
            Regex regex = new Regex(@"\[.*@.*\][\$|\#]");
            
            string output = String.Empty;
            var match = regex.Match(output);
            while (shells.DataAvailable || !match.Success)
            {
                if (shells.CanRead)
                    output = shells.ReadLine();
                match = regex.Match(output);
                if (!output.StartsWith("Last login") && !(output.EndsWith(input) && i < 4))
                    Console.WriteLine(output);
                Thread.Sleep(200);
            }

and then ,here is the output

PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.016 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.024 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.019 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.021 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.022 ms
64 bytes from 127.0.0.1: icmp_seq=6 ttl=64 time=0.026 ms
64 bytes from 127.0.0.1: icmp_seq=7 ttl=64 time=0.020 ms
64 bytes from 127.0.0.1: icmp_seq=8 ttl=64 time=0.026 ms
64 bytes from 127.0.0.1: icmp_seq=9 ttl=64 time=0.020 ms
64 bytes from 127.0.0.1: icmp_seq=10 ttl=64 time=0.021 ms

--- 127.0.0.1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9000ms
rtt min/avg/max/mdev = 0.016/0.021/0.026/0.005 ms

but when i change the input like this

string input = "cd /home/t";

and ,in putty,the output is like this

-bash: cd : /home/t : No such file or directory

but,using my codes, there is no output.so, my question is how to get the error stream.