(PowerShell) 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.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$ssh = New-Object Chilkat.Ssh

$port = 22
$success = $ssh.Connect("the-ssh-server.com",$port)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

# Authenticate using login/password:
$success = $ssh.AuthenticatePw("theSshLogin","theSshPassword")
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

# Start several commands on the server.
$channel1 = $ssh.QuickCmdSend("df")
if ($channel1 -lt 0) {
    $($ssh.LastErrorText)
    exit
}

$channel2 = $ssh.QuickCmdSend("date")
if ($channel2 -lt 0) {
    $($ssh.LastErrorText)
    exit
}

$channel3 = $ssh.QuickCmdSend("echo hello world")
if ($channel3 -lt 0) {
    $($ssh.LastErrorText)
    exit
}

# Now collect the results of each command.
$pollTimeoutMs = 50
$numFinished = 0
while ($numFinished -lt 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 -eq -2) {
        $($ssh.LastErrorText)
        exit
    }

    if ($channel -ge 0) {
        $("---- channel " + $channel + " finished ----")
        $($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