(Node.js) 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.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var ssh = new chilkat.Ssh();

    var port = 22;
    var success = ssh.Connect("the-ssh-server.com",port);
    if (success !== true) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Authenticate using login/password:
    success = ssh.AuthenticatePw("theSshLogin","theSshPassword");
    if (success !== true) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Start several commands on the server.
    var channel1 = ssh.QuickCmdSend("df");
    if (channel1 < 0) {
        console.log(ssh.LastErrorText);
        return;
    }

    var channel2 = ssh.QuickCmdSend("date");
    if (channel2 < 0) {
        console.log(ssh.LastErrorText);
        return;
    }

    var channel3 = ssh.QuickCmdSend("echo hello world");
    if (channel3 < 0) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Now collect the results of each command.
    var pollTimeoutMs = 50;
    var 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.
        var channel = ssh.QuickCmdCheck(pollTimeoutMs);
        if (channel == -2) {
            console.log(ssh.LastErrorText);
            return;
        }

        if (channel >= 0) {
            console.log("---- channel " + channel + " finished ----");
            console.log(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

}

chilkatExample();