Process count wrong when only one process matches criteria

Trying to use get-process to determine when one job is finished to start
another one
$abc | % {
([wmiClass]"\\localhost\ROOT\CIMV2:win32_process").Create("xyz");
while ((get-process xyz).count -gt 0 {start-sleep 60}
}

However when there is only one process that matches the count property does
not return 1 and the comparison operators don't return the expected results.
See below for examples.

When two calc processes are running
PS C:\> (get-process calc).count -gt 0
True
PS C:\> (get-process calc).count
2
PS C:\>

When one calc proecess is running
PS C:\> (get-process calc).count -gt 0
False
PS C:\> (get-process calc).count
PS C:\>

It's the way PowerShell handles, or mishandles, scalar objects. Wrap the get-process statement in array notation '@()':

$abc | % {
([wmiClass]"\\localhost\ROOT\CIMV2:win32_process").Create("xyz");
while (@(get-process xyz).count -gt 0 {start-sleep 60}
}

--
Kiron

Thank you that got it.

"Kiron" wrote:

"malverson26" <malverson26@xxxxxx> wrote in message
news:4F55A117-5C0D-4FCB-8D9E-2F52A650D6AE@xxxxxx There are some other nuances concerning scalars vs collections vs empty set
(no output). I wrote a blog post on this subject you might find useful:

http://keithhill.spaces.live.com/blo...3A97!816.entry

--
Keith