Swift

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. Swift

func chilkatTest() {
    var success: Bool = false

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

    let ssh = CkoSsh()!

    var port: Int = 22
    success = ssh.connect(hostname: "the-ssh-server.com", port: port)
    if success != true {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Authenticate using login/password:
    success = ssh.authenticatePw(login: "theSshLogin", password: "theSshPassword")
    if success != true {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Start several commands on the server.
    var channel1: Int = ssh.quickCmdSend(command: "df").intValue
    if channel1 < 0 {
        print("\(ssh.lastErrorText!)")
        return
    }

    var channel2: Int = ssh.quickCmdSend(command: "date").intValue
    if channel2 < 0 {
        print("\(ssh.lastErrorText!)")
        return
    }

    var channel3: Int = ssh.quickCmdSend(command: "echo hello world").intValue
    if channel3 < 0 {
        print("\(ssh.lastErrorText!)")
        return
    }

    // Now collect the results of each command.
    var pollTimeoutMs: Int = 50
    var numFinished: Int = 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: Int = ssh.quickCmdCheck(pollTimeoutMs: pollTimeoutMs).intValue
        if channel == -2 {
            print("\(ssh.lastErrorText!)")
            return
        }

        if channel >= 0 {
            print("---- channel \(channel) finished ----")
            print("\(ssh.getReceivedText(channelNum: channel, charset: "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

}