Perl

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. Perl

use chilkat();

$success = 0;

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

$ssh = chilkat::CkSsh->new();

$port = 22;
$success = $ssh->Connect("the-ssh-server.com",$port);
if ($success != 1) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Authenticate using login/password:
$success = $ssh->AuthenticatePw("theSshLogin","theSshPassword");
if ($success != 1) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Start several commands on the server.
$channel1 = $ssh->QuickCmdSend("df");
if ($channel1 < 0) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

$channel2 = $ssh->QuickCmdSend("date");
if ($channel2 < 0) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

$channel3 = $ssh->QuickCmdSend("echo hello world");
if ($channel3 < 0) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Now collect the results of each command.
$pollTimeoutMs = 50;
$numFinished = 0;
while ($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.
    $channel = $ssh->QuickCmdCheck($pollTimeoutMs);
    if ($channel == -2) {
        print $ssh->lastErrorText() . "\r\n";
        exit;
    }

    if ($channel >= 0) {
        print "---- channel " . $channel . " finished ----" . "\r\n";
        print $ssh->getReceivedText($channel,"ansi") . "\r\n";
        $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