Join Stack Overflow to learn, share knowledge, and build your career. I'm trying to get to grips with PowerShell. A simple thing I'm struggling to work out is that there seems to be a number of different ways to output messages.
Which should I use and what is the difference, and is there a conventional way of doing it? Shouldn't the expression be evaluated to produce a single concatenated string before it gets written out?
Write-Output should be used when you want to send data on in the pipe line, but not necessarily want to display it on screen. The pipeline will eventually write it to out-default if nothing else uses it first. Write-Host should be used when you want to do the opposite.
WriteLine is essentially what Write-Host is doing behind the scenes. You'll need to enclose How To Write 1000 In Japanese concatenation operation in parenthesis so that that PowerShell processes the concatenation before tokenizing the parameter list for Write-Host. Back when I started learning PowerShell I found this to be the most useful explanation of how the pipeline works. Apart from what Andy mentioned, there is another difference which could be important - write-host directly writes to the host and return nothing, meaning that you can't redirect the output, e.
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As seen, you can't redirect them into a file. This maybe surprising for someone who are not careful. Here's another way to accomplish the equivalent of Write-Output.
Just put your string in quotes:. This cmdlet is typically used in scripts to display strings and other objects on the console. However, because the default behavior is to display the objects at the end of a pipeline, it is generally not necessary to use the cmdlet. In my limited experience, I've found when working with any sort of real world data I need to abandon the cmdlets and go straight for the lower level commands to get any decent performance out of my scripts.
That doesn't happen, but the fact remains that it's not the powershell idiom and there's nothing you can do with [console]:: Another, better, more recently applicable answer is that write-host wraps write-information so its data gets put on a stream like write-error so you can capture it and use it elsewhere. Run this demonstration code and examine the result.
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Test-Output Receive-Output Output not piped to 2nd function, only displayed in first. Test-Output You'll need to enclose the concatenation operation in parenthesis so that that PowerShell processes the concatenation before tokenizing the parameter list for Write-Host.
In an Azure WebJob [console]:: WriteLine works but Write-Host will result in an error: The Win32 internal error "The handle is invalid" 0x6 occurred while setting character attributes for the console output buffer. Don't ask continue reading why.
But if switched to use write-output instead, you'll get redirection working as expected. KFL 6, 7 40 Just put your string in quotes: Twisty Impersonator 5 FarmerBob 6 8.
From my testing Write-Output and [Console]:: WriteLine perform much better than Write-Host. Depending on how much text you need to write out this may be important. Sign up or log in Sign up using Google. Sign up using Facebook.
Write-Output when you're emitting results.