Java

SSH Parallel Remote Commands on Single Server

See more SSH Examples

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

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // 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;
    success = ssh.Connect("the-ssh-server.com",port);
    if (success != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

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

    // Start several commands on the server.
    int channel1 = ssh.QuickCmdSend("df");
    if (channel1 < 0) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    int channel2 = ssh.QuickCmdSend("date");
    if (channel2 < 0) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    int channel3 = ssh.QuickCmdSend("echo hello world");
    if (channel3 < 0) {
        System.out.println(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) {
            System.out.println(ssh.lastErrorText());
            return;
            }

        if (channel >= 0) {
            System.out.println("---- channel " + channel + " finished ----");
            System.out.println(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
  }
}