(Android™) SSH Parallel Remote Commands on Single Server

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Shows how to execute multiple commands in parallel on a single SSH server and retrieve the command output for each.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSsh ssh = new CkSsh();

    int port = 22;
    boolean success = ssh.Connect("the-ssh-server.com",port);
    if (success != true) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Authenticate using login/password:
    success = ssh.AuthenticatePw("theSshLogin","theSshPassword");
    if (success != true) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Start several commands on the server.
    int channel1 = ssh.QuickCmdSend("df");
    if (channel1 < 0) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    int channel2 = ssh.QuickCmdSend("date");
    if (channel2 < 0) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    int channel3 = ssh.QuickCmdSend("echo hello world");
    if (channel3 < 0) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Now collect the results of each command.
    int pollTimeoutMs = 50;
    int numFinished = 0;
    while (numFinished < 3) {
        // Check to see if anything has finished.
        // QuickCmdCheck returns -1 if there are no errors and nothing else finished
        // QuickCmdCheck returns -2 if there was an error (such as a lost connection)
        // QuickCmdCheck returns a channel number if a channel finished.
        int channel = ssh.QuickCmdCheck(pollTimeoutMs);
        if (channel == -2) {
            Log.i(TAG, ssh.lastErrorText());
            return;
            }

        if (channel >= 0) {
            Log.i(TAG, "---- channel " + String.valueOf(channel) + " finished ----");
            Log.i(TAG, ssh.getReceivedText(channel,"ansi"));
            numFinished = numFinished + 1;
            }

        }

    // --------------
    // Sample output:

    // 	---- channel 105 finished ----
    // 	hello world
    // 
    // 	---- channel 104 finished ----
    // 	Thu Dec 22 17:43:58 CST 2016
    // 
    // 	---- channel 103 finished ----
    // 	Filesystem    512-blocks      Used  Available Capacity  iused     ifree %iused  Mounted on
    // 	/dev/disk2    2176716032 265739728 1910464304    13% 33281464 238808038   12%   /
    // 	devfs                382       382          0   100%      662         0  100%   /dev
    // 	map -hosts             0         0          0   100%        0         0  100%   /net
    // 	map auto_home          0         0          0   100%        0         0  100%   /home
    // 	/dev/disk3s2      374668    374668          0   100%    93665         0  100%   /Volumes/Google Chrome

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}