Vista - "Dynamic" properties in functions.

Hi,

I'm trying to write something like this:

Function grep
{
param([string]$prop, [string]$expr)
$input | where { $_.$prop -like "$expr" }
}

Example of use:

get-services | grep "Name", "sched*"

It shoud return only the "schedule" service, but returns all of them.

The following command returns what I want (only the "schedule" service
record):

$x="Name";$y="sched*";get-service | where { $_.$x -like "$y" }

The question is: why it doesn't work in a function?

Regards,

On 20 ÍÁÒ, 03:45, dvl <d...@xxxxxx> wrote:What about this:
Get-Service | Where{ $_.Name -match 'sched' }

About function - let me think a few minutes

Try:


function grep($prop,$expr){
while ($input.MoveNext()) {
if($input.current.$prop -like $expr){
Write-Output $input.current
}
}
}



PS > get-service | grep Name sched*


Status Name DisplayName
------ ---- -----------
Running Schedule Task Scheduler



PS > get-process | grep ProcessName ls*

Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id ProcessName
------- ------ ----- ----- ----- ------ -- -----------
651 12 5452 6316 47 244.59 668 lsass




-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com

On 20 ÍÁÒ, 03:45, dvl <d...@xxxxxx> wrote:All is work:

PS C:\> function grepPS C:\> get-service | grep 'name' 'winrm'

Status Name DisplayName
------ ---- -----------
Running WinRM Windows Remote Management (WS-Manag...


PS C:\> function grepPS C:\> get-service | grep 'name' 'winrm'

Status Name DisplayName
------ ---- -----------
Running WinRM Windows Remote Management (WS-Manag...


PS C:\> function grepPS C:\> get-service | grep 'name' 'winrm'

Status Name DisplayName
------ ---- -----------
Running WinRM Windows Remote Management (WS-Manag...

Maybe I lost something?

Another version, shorter


function grep($prop,$expr){
begin{}; process{ if($_.$prop -like $expr){$_} }
}


PS> gsv | grep Name sched*


Status Name DisplayName
------ ---- -----------
Running Schedule Task Scheduler



-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com
PS>> get-service | grep Name sched*
PS>>PS>> get-process | grep ProcessName ls*
PS>>

You're OK ajax76, you made me wonder why I complicated it

dvl, It doesn't work because:

1. There is a typo. get-services should be get-service.
2. When assigning values to cmdlet parameters you should delimit them with
a space instead of a comma (... | grep Name sched*).

-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com

Thanks for the reply.

It's all my fault. I've failed to specify function parameters correctly.

function f($a, $b)

invoked like this: f a,b

will result in $a="a,b" and empty $b.

Silly error.

Regards,