JavaScript

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. JavaScript

var success = false;

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

var ssh = new CkSsh();

var port = 22;
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