Powershell Standard Error Output
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Powershell Redirect Stderr To Null
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Powershell Redirect Standard Output To Variable
standard and error output appending to the same log-file up vote 21 down vote favorite 7 I need to collect the standard output and error log from several processes into one single logfile. So every output must append to this logfile. I want to call all the jobs with lines like this: $p=start-process myjob.bat -redirectstandardoutput $logfile -redirecterroroutput $logfile -wait Where do I have to powershell redirect error output to file put the information to append? powershell powershell-v2.0 share|improve this question edited Jul 5 '12 at 18:13 Filburt 10.2k73265 asked Jan 19 '12 at 11:32 PSBeginner 161116 add a comment| 4 Answers 4 active oldest votes up vote 32 down vote In order to append to a file you'll need to use a slightly different approach. You can still redirect an individual processes standard error and standard output to file but in order to append it to a file you'll need to do one of these things: Read the stdout/stderr file contents created by Start-Process Not use Start-Process and use the call operator & Not use Start-Process and start the process with .NET objects The first way would look like this: $myLog = "C:\File.log" $stdErrLog = "C:\stderr.log" $stdOutLog = "C:\stdout.log" Start-Process -File myjob.bat -RedirectStandardOutput $stdOutLog -RedirectStandardError $stdErrLog -wait Get-Content $stdErrLog, $stdOutLog | Out-File $myLog -Append The second way would look like this: & myjob.bat 2>&1 >> C:\MyLog.txt Or this: & myjob.bat 2>&1 | Out-File C:\MyLog.txt -Append The third way: $pinfo = New-Object System.Diagnostics.ProcessStartInfo $pinfo.FileName = "myjob.bat" $pinfo.RedirectStandardError = $true $pinfo.RedirectStandardOutput = $true $pinfo.UseShellExecute = $false $pinfo.Arguments = "" $p = New-Object System.Di
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Powershell Stdout
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Powershell Error Output
Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, powershell write-error without stack trace helping each other. Join them; it only takes a minute: Sign up Powershell: Capture program stdout and stderr to separate variables up vote 13 down vote favorite 1 Is it possible to redirect stdout from an external program http://stackoverflow.com/questions/8925323/redirection-of-standard-and-error-output-appending-to-the-same-log-file to a variable and stderr from external programs to another variable in one run? for example: $global:ERRORS = @(); $global:PROGERR = @(); function test(){ # Can we redirect errors to $PROGERR here, leaving stdout for $OUTPUT? $OUTPUT = (& myprogram.exe 'argv[0]', 'argv[1]'); if ( $OUTPUT | select-string -Pattern "foo" ) { # do stuff } else { $global:ERRORS += "test(): oh noes! 'foo' missing!"; } } test; if ( @($global:ERRORS).length -gt 0 ) { Write-Host "Script specific http://stackoverflow.com/questions/24222088/powershell-capture-program-stdout-and-stderr-to-separate-variables error occurred"; foreach ( $err in $global:ERRORS ) { $host.ui.WriteErrorLine("err: $err"); } } else { Write-Host "Script ran fine!"; } if ( @($global:PROGERR).length -gt 0 ) { # do stuff } else { Write-Host "External program ran fine!"; } A dull example however I am wondering if that is possible? windows powershell command-line stdout stderr share|improve this question edited Aug 11 at 2:50 mklement0 46.4k9106108 asked Jun 14 '14 at 16:44 dusz 1731211 You could use Start-Process to run myprogram.exe as described here. It captures STDOUT and STDERR separately. –Alexander Obersht Jun 14 '14 at 19:25 add a comment| 4 Answers 4 active oldest votes up vote 6 down vote accepted The easiest way to do this is to use a file for the stderr output e.g.: $output = & myprogram.exe 'argv[0]', 'argv[1]' 2>stderr.txt $err = get-content stderr.txt if ($LastExitCode -ne 0) { ... handle error ... } I would also use $LastExitCode to check for errors from native console exes. share|improve this answer edited Jun 15 '14 at 19:44 answered Jun 14 '14 at 19:26 Keith Hill 109k15176235 add a comment| up vote 8 down vote You should be using Start-Process with -RedirectStandardError -RedirectStandardOutput options. This other post has a great example how to do this (sampled from that post below): $pinfo = New-Object System.Diagnostics.ProcessStartInfo $pinfo.FileName = "ping.exe" $pinfo.RedirectStandardError = $true $pinfo.RedirectStandardOutput = $t
K. Suessmeyer -February 14, 20133 Share 0 0 While becoming familiar and a really big fan of PowerShell, I faced the following issue. During a migration project doing bulk migrations, I needed information Messages (coming to StdOut) as well https://blogs.msdn.microsoft.com/jenss/2013/02/14/powershell-stdout-go-out-stderr-go-everywhere/ as error message (coming to StdErr) displayed to the Console. Well that is quite http://serverfault.com/questions/340711/redirect-stderr-to-variable-in-powershell easy as being the standard behavior. The challenge was, that error in addition needed to be duplicated in an error file, that in case of an error you can simply grab all the non 0kb files and do through them in order to investigate the errors. It sorted out that this wasn´t easy at all error output as the output once being redirected cannot be easily duplicated. There were actually solution (which I could post as well if you are interested) including the tee object as well as the option to create a wrapper script, redirect the error output, read it at the end of the execution and write it to the console. But this wouldnß´t be as natural as having the error message at the exact powershell standard error place where it happens (which could somewhere in between). My colleague Dongbo Wang then pointed me in the right direction. For an easier repro as well as giving him the credits for this idea, here is what we came up with: The sample execution file contains several command, simulating normal messages as well as an error message: Write-Output "Before the error" Write-Output "================" Write-Error "Here is the error" Write-Output "================" Write-Output "After the error" For this sample we should be able to see the error message after the "Before" message and Before the after message. So save the above made statements to a script file psscript.ps1 and execute it with the following command: .\psscript.ps1 2>&1 | % { if ($_ -is [System.Management.Automation.ErrorRecord]) { $_ | Out-File -Append .\Errors.txt } $_ } So what happens here ? The messages (being objects) are piped and checked for their message type; if being of type [System.Management.Automation.ErrorRecord] they are collected and appended in a loop to the specified output error file. So what we get here is the output of and the error message within the created text file Errors.txt: -Jens Tags Powershell Comments (3) Cancel reply Name * Email * Website
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Redirect stderr to variable in powershell up vote 9 down vote favorite 2 I would like to script a dcdiag test to alert me if it finds any errors. I thought I may able to do this in powershell by... $test = dcdiag 2>$err I don't have any errors from dcdiag at the moment so I couldn't test that directly, but I wrote another ps script to throw an exception hoping I could test this method using that script. This didn't work using the method above so I opted for try{$test = dcdiag}catch{$err = $_.Exception.Message} It worked for my test case, but I don't know if this will pick up stderr from dcdiag. I would like to know how I should best achieve stderr redirect to a variable in powershell given I would like to use it with dcdiag? powershell share|improve this question asked Dec 14 '11 at 1:31 Ablue 690624 add a comment| 1 Answer 1 active oldest votes up vote 12 down vote accepted try..catch wouldn't help in this case. You might want to do: $test = dcdiag 2>&1 $err = $test | ?{$_.gettype().Name -eq "ErrorRecord"} if($err){ #error has occurred } share|improve this answer answered Dec 14 '11 at 1:57 manojlds 25625 2 Ah, I didn't say in the original question; is it possible to keep both stdout and stderr? i.e $test = stdout and $err = stderr? –Ablue Dec 14 '11 at 2:14 1 @Ablue - $test will have both, that is why I am filtering out the error to $err. –manojlds Dec 14 '11 at 2:15 Thanks a million :) –Ablue Dec 14 '11 at 2:17 Make sure $ErrorActionPreference is not set to "SilentlyContinue". When it is the errors stream is not available. –cmcginty Oct 28 '15 at 21:33 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Em