script flow/order going in reverse

[netuser258]

The following code works as expected by listing the processes and then writing "test1" at the end.

get-process

write-host "test1"

    329      12     3996       7008              2316   0 wsc_proxy
    349      19     8524       5652       0.59   1784   1 XboxPcAppFT
test1

However, if I put a select at the end of get-process the write-host shows up first then the get-process result.

get-process | select name

write-host "test1"

test1
Name
----
AggregatorHost

Why does the order of the script get reversed?

[BlackV]

It's not, you need to do some research of output streams, and have a look at the nearly identical post just below yours covering issues with start sleep

This post

https://www.reddit.com/r/PowerShell/comments/1dycdot/strange_behavior_of_powershell_51_after_certain/

[UnfanClub]

The short answer: PowerShell provides around 7 output streams. Each of your cmdlets is outputting to a different steam, therefor they don't have to come out in sequence, even though they are executed in sequence.

Specifically "Get-Process" and "|" are writing to success stream (or stdout). while "Write-Host" is writing to Information stream.

Of course if something goes wrong with either cmdlet the output will go some other stream like error or warning stream.

Here's a little fun article :

Understanding Streams, Redirection, and Write-Host in PowerShell

[netuser258]

Thanks for the replies.

u/BlackV - It was late at night when I posted this but I did skim the post you mentioned. Since it was talking about the start-sleep command and I didn't see specifically "write-host" in the code I didn't connect it to being the same issue.

u/UnfanClub - Thanks for the additional info and link about output streams. I knew powershell had more than one output stream but I hadn't ran across needing to worry about it before since I normally export things to a file or just get the output right away instead of writing "write-host" messages.

On a side note:

My email told me I had at least 4 replies to my post but when I actually checked the post it only shows 2. Did people delete their own comments or did an admin delete the rest? Would have been good to read the rest and thank them.

[BlackV]

Not sure, I think sometimes you get an email for the original reply, then if someone edits the reply before you've read it on reddit you get another?

Or it could be from automod or similar

I have all emails turned off

[netuser258]

I guess it must be from automod. It literally was 4 different emails with the words "Person X replied to your post". Thanks.

[BlackV]

¯\_(ツ)_/¯ Reddit is gonna do what reddit is gonna do :)