Writing errors and output to a text file and Console

Have you tried:

 .\MyScript.ps1 2>&1 | tee -filePath c:\results.txt

2>&1 is what you're looking for

Note: This answer works great in PowerShell 1.0 and 2.0, but will capture ONLY standard output and errors in PowerShell 3.0 and later.

I wasn't satisfied with any answer I was finding, so I mixed a few and came up with this (in PowerShell 3.0+):

$output = try{your_command *>&1}catch{$_}

With this you can capture all errors and output that are generated by trying to use your_command.

It catches exceptions when you use a non-existent command:

PS C:\Users\jdgregson> $output = try{your_command *>&1}catch{$_}PS C:\Users\jdgregson> echo $outputyour_command : The term 'your_command' is not recognized as the name of acmdlet, function, script file, or operable program. Check the spelling of thename, or if a path was included, verify that the path is correct and try again.At line:1 char:15+ $output = try{your_command 2>&1}catch{$_}+               ~~~~~~~~~~~~    + CategoryInfo          : ObjectNotFound: (your_command:String) [], Comman   dNotFoundException    + FullyQualifiedErrorId : CommandNotFoundExceptionPS C:\Users\jdgregson>

It catches exceptions when you pass invalid arguments to an existing command:

PS C:\Users\jdgregson> $output = try{cat C:\invalid-path.txt *>&1}catch{$_}PS C:\Users\jdgregson> echo $outputcat : Cannot find path 'C:\invalid-path.txt' because it does not exist.At line:1 char:15+ $output = try{cat C:\invalid-path.txt 2>&1}catch{$_}+               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~    + CategoryInfo          : ObjectNotFound: (C:\invalid-path.txt:String) [Ge   t-Content], ItemNotFoundException    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetCo   ntentCommand

And it catches the output if there was no problem with your command at all:

PS C:\Users\jdgregson> $output = try{cat C:\valid-path.txt *>&1}catch{$_}PS C:\Users\jdgregson> echo $outputthis file is really here

It works for your example too:

PS C:\Users\jdgregson> $output = try{Test-Error *>&1}catch{$_}PS C:\Users\jdgregson> echo $outputechoWARNING: warningTest-Error : errorAt line:1 char:15+ $output = try{Test-Error *>&1}catch{$_}+               ~~~~~~~~~~~~~~~    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorExcep   tion    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorExceptio   n,Test-Error

By default only the Success stream of data is passed on to the Output file. To direct errors and warnings you will have to add something like this :

your script 3>&1 2>&1 | Out-file log.txt