I would like to run a program and save its output into a file. The program starts, I see a cmd window pop-up, but the file is alway empty. I tryed these versions:
start snmpwalk.exe "parameters will be here" >text.txt
start snmpwalk.exe "parameters will be here" 2>&1 | out-file text.txt
Can you help me how to solve the problem?
Thanks
You don't need to use start, you should be able to just use the command as normal from within powershell.
A slightly more powershell way would be to use invoke-expression
invoke-expression "snmpwalk [parameters]" | out-file text.text
Related
Hello i am not able to run this command:
wmic memorychip get | clip
This command does not returns any output or error.
I am using windows 7.
Kindly tell me what to do?
Thanks
This happens, as the output is piped to clip.exe. In other words, the output is there, but is sent to clipboard instead of printing it into the console.
As a side note, consider using Set-Clipboard instead of clip.exe, if you have Powershell 5.1 or newer.
If there's a need to send output to clipboard and see it too, use Tee-Object like so,
wmic memorychip get | tee-object -variable foo | set-clipboard; $foo
As vonPryz answered that the ouput is there but is redirected to clip.exe(A program that redirects output of command line tools to the Windows clipboard).but as you have described that you have windows 7,vonPryz solution won't work.you can use wmic memorychip to show output on console but it will mess up the output. you should echo the output in a file to see it(i.ewmic memorychip >>output.txt) or use the following batch file:
#echo off
wmic memorychip >>output.txt
notepad output.txt
pause >nul
I am trying to use 2goarray to write a .ico file to a go file so that I can use it in systray.
My problem is that this works in cmd:
TYPE icon.ico | 2goarray Data icon > icon.go
But running the equivalent command in powershell does not:
Get-Content .\icon.ico | 2goarray Data icon | Out-File -FilePath .\icon.go -Encoding UTF8
When I say it doesn't work, I don't mean an error occurs, I mean that the array produced by 2goarray is not correct, it contains data that systray doesn't recognize as an icon.
For reference, here is the working icon.go, here is the broken/corrupted one produced by powershell, and here is the icon I am using.
I suspect it has something to do with the way that powershell passes things as objects, but I'm not sure?
Your challenge is to pipe binary data in PowerShell, which is not that straight forward. I tested your example with this command and I get the "working" icon.go:
Start-Process 2goarray -ArgumentList "Data icon" -RedirectStandardInput .\icon.ico -RedirectStandardOutput .\icon.go
But this solution seems to be quite slow compared to cmd. From PowerShell you can also always call cmd if you want to, which works surprisingly faster for your example:
Start-Process cmd -ArgumentList "/c TYPE icon.ico | 2goarray Data icon > icon.go"
Often, it is a bad design to call cmd from PowerShell, because PowerShell can nearly do everything that cmd can do, and often more, but for your example, this seems to be the better solution.
I am running a fairly complex python script from a powershell script. I would like to both display the stdout and stderr streams of the .python script in the console in real time (ie as the .py script writes to them) and also write them to a file.
My current solution looks like this:
Do-PreliminaryStuff
log = & ".\myPyScript.py" -myArgument "\this\that\thingy.txt" 2>&1 $log
Write-Output $log
$log | Out-File "$logDir\pyScriptLog.log"
Do-RestOfScript
This has the problem that the text is only printed out after the .py script has finished, making it much harder to watch the progress of the .py script.
Is there a way to somehow ..sample.. the pipeline as object go through it?
You are probably looking for the Tee-Object cmdlet.
Use Tee-Object - it splits the pipeline into a filestream before continuing:
& ".\myPyScript.py" -myArgument "\this\that\thingy.txt" 2>&1 |Tee-Object -FilePath $log
I run into an issue with the PowerShell 4.0 Tee-Object command (alias tee) and the command that I'm using is as follows:
powershell "cmd /c dir | Tee-Object -filepath C:\1.txt -Append"
When 1.txt is an empty file, it writes the output as you see on the screen (as-is). But if 1.txt has some existing content before you run the command, it appends the output with no new lines and the files looks completely messed up.
I'm surprised to see this behavior and any thoughts would help me to proceed further. Note that I have to use the Tee-Object command as I would like to see the output on the screen when a command is running and append it to the existing log file that has some contents.
I'm trying to write a Powershell script for work that will take the output of w32tm.exe \monitor and output everything into a text file. I'm trying the following code, however something is wrong since I'm able to create the text file, but nothing is being written in it:
#Take output of w32tm.exe and output into a plain text file
$file = "C:\Documents and Settings\a411882\My Documents\Scripts\timeScript.txt"
$executable = "w32tm.exe /monitor"
invoke-expression $executable | out-file -filepath $file
What am I doing wrong here? I'm new to Powershell so any advice would be greatly appreciated!
EDIT:
I can get all of the data to be displayed on the console when I run this, however I want the data to be written on the text file.
EDIT 2:
I managed to get everything to finally output. I wanted to try avoiding using the > operator to write out to the text file in hopes of learning a little more on the out-file cmdlet however doing a simple invoke-expression $executable > $file managed to get the job done. I still don't understand why the cmdlet wouldn't work properly.
Perhaps Invoke-Expression isn't properly sending output to stdout? I wouldn't expect that, but stranger things have happened. Try running w32tm.exe on its own:
$file = "C:\Documents and Settings\a411882\My Documents\Scripts\timeScript.txt"
w32tm.exe /monitor | Out-File -FilePath $file
You could use Start-Process which allows you to redirect also the error output:
Start-Process w32tm.exe -ArgumentList "/monitor" -Wait -RedirectStandardOutput "output.txt" -RedirectStandardError "error.txt"