Powershell foreach syntax error

Question

I am using powershell to read a text file which has text in lines and display items. How do I use parallel foreach instead of foreach. I tried foreach and it works but foreach parallel syntax didnt work.

$lines = Get-Content myFile.txt | Where {$_ -notmatch '^\s+$'} 
Foreach ($Item in $lines) 
{
$Item 
}

MyFile.Txt

newyork is great 
seattle is cold
florida is hot

This is what I tried

$lines = Get-Content myFile.txt | Where {$_ -notmatch '^\s+$'} 
      ForEach -Parallel ($Item in $lines)
            {
            $Item
            }

Error: -parallel an be used only in workflow

Murilo Santana · Accepted Answer · 2016-09-27 03:12:09Z

1

To use the ForEach -parallel, use your code like this:

workflow myworkflow{
    $lines = Get-Content myFile.txt | Where {$_ -notmatch '^\s+$'} 
    ForEach -Parallel ($Item in $lines){
        sequence{
            $Item
        }
    }
}

Then, call you workflow: myworkflow.

Workflow are very useful, here you can find more info:

hope it's useful

answered Sep 27, 2016 at 3:12

Murilo Santana

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2 Comments

Kurkula Over a year ago

Really helpful. What is the use of sequence in this case? even with parallel i see each record displaying one at a time.

Murilo Santana Over a year ago

Great! This is definition of the sequence keyword: The Sequence keyword runs commands in sequence within a Parallel script block. The Sequence script block runs in parallel with other commands, but the commands within the sequence script block run sequentially and in the specified order. Have a look at this for some examples :)

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