Hi Ray,
Welcome to the world of guessing! Where the powershell developers had to
guess which type of arrays to give you by default. In Powershell, there are
arrays that are static (fixed length), and real arrays like you know from
C#, etc. In powershell, $a = 1,2,3 will give you one of those static
arrays. if you then do $a += 4, it will create a new array of length
$a.Count + 1 and copy all contents of $a into the new array before
populating the final item with the 4. This is why doing looping with +=
will in cases with lots of loops or larger datasets waste a TON of CPU
creating and deleting useless arrays. In order to get the arraylist that
you are thinking of using (that can .add() and .remove()), you need to use
ArrayList from Syste,Collections. Also, -= is not a thing for powershell.
Consider this example:
[image: Inline image 1]
And I could just as easily do:
PS C:\downloads> [System.Collections.ArrayList]$a = 1,2,3
PS C:\downloads> $a.Remove(2)
PS C:\downloads> $a
1
3
PS C:\downloads> $a.Remove(3)
PS C:\downloads> $a
1
Lastly, select should work fine:
foreach ($comp in $array){Test-Connection $comp -Count 1} | Select
Destination, IPv4Address
foreach ($comp in $array){Test-Connection $comp -Count 1 | Select
Destination, IPv4Address }
These are functionally the same, but in case 1, it will gather all results
from the foreach before piping to a single select. Case 2 will pipe each
result to select before going onto the next iteration. Just a style choice
there for you.
Thanks,
Devin Rich
Systems Administrator
On Thu, Oct 19, 2017 at 11:33 AM, Raymond Peng <raymond.p...@wageworks.com>
wrote:
> Hi All,
>
>
>
> Still picking up powershell so please let me know if you see any obvious
> blunders: I see it say the collection is of a fixed size but how do I
> remove?
>
>
>
> I have declared an array with $array=”name1”,”name2”, etc…
>
> I can access each element with $array[0]…
>
>
>
> I can use $array += “name5,”name6” but I can not figure out how to remove
> an element
>
> I have tried the Remove method without any luck as well as -=
>
>
>
> PS C:\WINDOWS\system32> $array.Remove("cxsupportsystems")
>
> Exception calling "Remove" with "1" argument(s): "Collection was of a
> fixed size."
>
> At line:1 char:1
>
> + $array.Remove("cxsupportsystems")
>
> + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> + CategoryInfo : NotSpecified: (:) [],
> MethodInvocationException
>
> + FullyQualifiedErrorId : NotSupportedException
>
>
>
> PS C:\WINDOWS\system32> $array
>
> kcfileserver
>
> wnweb01
>
> pvfile01
>
> corpcxtsgp01
>
> cxsupportsystems
>
>
>
> Lastly – formatting question:
>
>
>
> Is there any way to just crop out the rest and keep the destination /
> IPv4Address info? I tried format-table / select-object but it does not do
> what I want. I’ve tried piping after the test-connection in the scriptblock
> but output is not what I want
>
>
>
>
>
> PS C:\WINDOWS\system32> foreach ($comp in $array){Test-Connection $comp
> -Count 1}
>
>
>
> Source Destination IPV4Address
> IPV6Address Bytes Time(ms)
>
> ------ ----------- -----------
> ----------- ----- --------
>
> L-SM-RPENG1 kcfileserver 172.29.133.130
> 32 62
>
> L-SM-RPENG1 wnweb01 172.29.118.101
> 32 66
>
> L-SM-RPENG1 pvfile01 172.29.171.28
> 32 72
>
> L-SM-RPENG1 corpcxtsgp01 172.29.118.164
> 32 70
>
> L-SM-RPENG1 cxsupportsys... 10.2.1.238
> 32 55
>
>
>
>
>
>
> * Thank you,*
>
>
>
> *Ray*
>
>
>
>
>
>
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