(Delphi ActiveX) 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.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ssh: TChilkatSsh;
port: Integer;
success: Integer;
channel1: Integer;
channel2: Integer;
channel3: Integer;
pollTimeoutMs: Integer;
numFinished: Integer;
channel: Integer;

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

ssh := TChilkatSsh.Create(Self);

port := 22;
success := ssh.Connect('the-ssh-server.com',port);
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;

// Authenticate using login/password:
success := ssh.AuthenticatePw('theSshLogin','theSshPassword');
if (success <> 1) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;

// Start several commands on the server.
channel1 := ssh.QuickCmdSend('df');
if (channel1 < 0) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;
channel2 := ssh.QuickCmdSend('date');
if (channel2 < 0) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;
channel3 := ssh.QuickCmdSend('echo hello world');
if (channel3 < 0) then
  begin
    Memo1.Lines.Add(ssh.LastErrorText);
    Exit;
  end;

// Now collect the results of each command.
pollTimeoutMs := 50;
numFinished := 0;
while numFinished < 3 do
  begin
    // 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.
    channel := ssh.QuickCmdCheck(pollTimeoutMs);
    if (channel = -2) then
      begin
        Memo1.Lines.Add(ssh.LastErrorText);
        Exit;
      end;
    if (channel >= 0) then
      begin
        Memo1.Lines.Add('---- channel ' + IntToStr(channel) + ' finished ----');
        Memo1.Lines.Add(ssh.GetReceivedText(channel,'ansi'));
        numFinished := numFinished + 1;
      end;
  end;

// --------------
// 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
end;