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Get the Exit Status of a Remote SSH Command

Demonstrates the Chilkat Ssh.GetChannelExitStatus method, which returns the remote process exit status for a channel. The only argument is the channel number. Call it only after ChannelReceivedExitStatus returns true.

Background: The exit status is how you learn whether a remote command actually succeeded — recall that a successful exec request only means the request was accepted. By Unix convention 0 means success and any nonzero value indicates a failure. Retrieve it promptly after the receive operation and before calling unrelated SSH methods or releasing the channel, since the completed channel record can be discarded.

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Local $bSuccess = False

;  Demonstrates the Ssh.GetChannelExitStatus method, which returns the remote process exit
;  status for a channel.  The only argument is the channel number.  Call it only after
;  ChannelReceivedExitStatus returns True.

$oSsh = ObjCreate("Chilkat.Ssh")

Local $iSshPort = 22
$bSuccess = $oSsh.Connect("ssh.example.com",$iSshPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  Normally you would not hard-code the password in source.  You should instead obtain it
;  from an interactive prompt, environment variable, or a secrets vault.
Local $sPassword = "mySshPassword"

$bSuccess = $oSsh.AuthenticatePw("mySshLogin",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

Local $iChannelNum = $oSsh.OpenSessionChannel()
If ($iChannelNum < 0) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oSsh.SendReqExec($iChannelNum,"grep -q root /etc/passwd")
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  IMPORTANT: Set a read timeout.  ReadTimeoutMs defaults to 0, which means no limit -- without
;  it, this call waits forever if the server never sends channel close.
$oSsh.ReadTimeoutMs = 15000

$bSuccess = $oSsh.ChannelReceiveToClose($iChannelNum)
If ($bSuccess = False) Then
    ConsoleWrite($oSsh.LastErrorText & @CRLF)
    Exit
EndIf

;  Retrieve the exit status immediately, before calling unrelated SSH methods or releasing the
;  channel, because the completed channel record can be discarded.
If ($oSsh.ChannelReceivedExitStatus($iChannelNum)) Then
Local $iExitStatus = $oSsh.GetChannelExitStatus($iChannelNum)
    ConsoleWrite("Exit status: " & $iExitStatus & @CRLF)

    ;  By convention, 0 means the remote command succeeded.
    If ($iExitStatus = 0) Then
        ConsoleWrite("The remote command succeeded." & @CRLF)
    Else
        ConsoleWrite("The remote command reported a failure." & @CRLF)
    EndIf

EndIf

$oSsh.Disconnect