Powershell plink telnet 命令输出到 var

Question

I'm trying to write a script (based on some internet examples) for some telnet/ssh command execution, using powershell and plink. But the main feature, which I'd like to implement - is to catch this command's output into the variable or a text file. How can I intercept the output of the specific command?

For example: when I send "get-status" command, it returns "Status is 01 02 03". Can I assign this string to the var or text file? Maybe, only "01 02 03" without "Status" text?

$ps = New-Object -TypeName System.Diagnostics.Process
$ps.StartInfo.UseShellExecute = $false
$ps.StartInfo.RedirectStandardInput = $true
$ps.StartInfo.FileName = "plink"
$ps.StartInfo.Arguments = "-telnet XXX.XXX.XXX.XXX"

[void]$ps.Start() 

$PlinkStreamWriter = $ps.StandardInput

Start-Sleep -m 500
$PlinkStreamWriter.Write("login`r")
Start-Sleep -m 500
$PlinkStreamWriter.Write("password`r")
Start-Sleep -m 500
$PlinkStreamWriter.Write("get-status")
Start-Sleep -m 500

Write-Host "Status string: " .....

$PlinkStreamWriter.Write("exit`r")
$PlinkStreamWriter.Close();
if (!$ps.HasExited) { $ps.Kill() }

Answer 1

If I understand you correctly, when you send

$PlinkStreamWriter.Write("get-status")

You receive

Status is 01 02 03

If this is consistent and you want to assign this value to a variable, just define the variable at the beginning of your command:

$result =  $PlinkStreamWriter.Write("get-status")

Now if you want to remove "Status is" from the value stored in $result:

$result = $result -replace "Status is ",""

Now $result contains only "01 02 03"

You can now update your write-host command:

Write-Host "Status string: $result"

Answer 2

A simple redirect (>) is all that is needed. I verified this works for me in Powershell v5.1.22000.282. Here is my approach for anyone that needs it.

$filepath = "$PSScriptRoot"
$PUTTY="$Env:ProgramFiles\\PuTTY\\plink.exe"

@"
vncserver -geometry 1920x1080
exit
"@| & $PUTTY -ssh $IP -l $USER -pw $PW > "$filepath/out.txt"

Answer 3

This may be of use, you can redirect the outputs from error messages and warning messages into standard out. Example:

Invoke-Expression "cmd /c 'C:\\Program Files (x86)\\PuTTY\\plink.exe'$plinkcmd 4>&1 3>&1 2>&1"