(Ruby) 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 Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# 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 != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Authenticate using login/password:
success = ssh.AuthenticatePw("theSshLogin","theSshPassword")
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Start several commands on the server.
channel1 = ssh.QuickCmdSend("df")
if (channel1 < 0)
    print ssh.lastErrorText() + "\n";
    exit
end

channel2 = ssh.QuickCmdSend("date")
if (channel2 < 0)
    print ssh.lastErrorText() + "\n";
    exit
end

channel3 = ssh.QuickCmdSend("echo hello world")
if (channel3 < 0)
    print ssh.lastErrorText() + "\n";
    exit
end

# 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() + "\n";
        exit
    end

    if (channel >= 0)
        print "---- channel " + channel.to_s() + " finished ----" + "\n";
        print ssh.getReceivedText(channel,"ansi") + "\n";
        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