PowerShell: Or Condition in While Loop

Question

I've a really simple problem, but i dont get it working. I have a loop which checks if one of two possible files is existing, if not then sleep and check again in two seconds.

while (([System.IO.File]::Exists($terminationFile) -ne $true) -or ([System.IO.File]::Exists($noFile) -ne $true)) {
    # wait 2 seconds and check again
    Start-Sleep -s 2
}

If I check both conditions in the same loop it checks only the first one.

Would be great if anybody can help

Regards, Justin

You probably mean: while (!(Test-Path $terminationFile) -and !(Test-Path $noFile)) { Start-Sleep -s 2 } — David Brabant
– David Brabant, Commented Sep 2, 2014 at 14:32
Thank you, I'll try it. But why is it working when I only check for: while ([System.IO.File]::Exists($terminationFile) -ne $true) ? — nitsuj1001
– nitsuj1001, Commented Sep 2, 2014 at 14:40
It because if the first check succeeds IE its false then the second check is never run. If the first check fails then it would check the second. If you want both checks to succeed before doing anything use -and like David said — Dane Boulton
– Dane Boulton, Commented Sep 2, 2014 at 15:11

Community · Accepted Answer · 2017-05-23 12:18:18Z

3

An interpretaion of David Brant worked for me:

while (!(Test-Path -Path $terminationFile) -or !(Test-Path -Path $noFile)) {
    Start-Sleep 2
}

edited May 23, 2017 at 12:18

CommunityBot

11 silver badge

answered May 17, 2017 at 7:46

merkucio L

314 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

PowerShell: Or Condition in While Loop

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related