Reusing powershell cmdlet parameters - powershell

Question

I was wondering if it was possible to call a parameter twice within a cmdlet, such as:
cmdlet-test -myCommand input1, input2 -myCommand input3, input 4
myCommand being the same command twice. Is that possible or will a user just have to write it all in one comma separated list?

Answer 1

If the user attempts to use the same parameter twice, they will receive an error.
get-process | select -first 2
Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id ProcessName
------- ------ ----- ----- ----- ------ -- -----------
201 16 3324 3456 109 0.17 9972 acrotray
409 16 3904 4948 101 0.97 10520 AdobeARM
Let's try it the conventional way:
get-process -pid 9972,10520
Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id ProcessName
------- ------ ----- ----- ----- ------ -- -----------
201 16 3324 3456 109 0.17 9972 acrotray
409 16 3904 4948 101 0.97 10520 AdobeARM
And your proposed method:
get-process -pid 9972 -pid 10520
Get-Process : Cannot bind parameter because parameter 'Id' is specified more than once. To provide multiple values to
parameters that can accept multiple values, use the array syntax. For example, "-parameter value1,value2,value3".
At line:1 char:23
+ get-process -pid 9972 -pid 10520
+ ~~~~
+ CategoryInfo : InvalidArgument: (:) [Get-Process], ParameterBindingException
+ FullyQualifiedErrorId : ParameterAlreadyBound,Microsoft.PowerShell.Commands.GetProcessCommand

Answer 2

For those who would like to separate a really long function argument into several lines, I suggest this approach:
# Just an example function
function PrintFileName {
param (
[Parameter(Mandatory = $true)] [System.String[]] $Files = #()
)
foreach ($File in $Files) {
Write-Host "${File}"
}
}
Then, the function call like this:
PrintFileName -Files C:\SomeDirectory\SomeFile.txt1,C:\SomeDirectory\SomeFile2.txt,`
C:\SomeDirectory\SomeFile2.txt,C:\SomeDirectory\SomeFile3.txt,`
C:\SomeDirectory\SomeFile4.txt,C:\SomeDirectory\SomeFile5.txt
Will output:
C:\SomeDirectory\SomeFile1.txt
C:\SomeDirectory\SomeFile2.txt
C:\SomeDirectory\SomeFile2.txt
C:\SomeDirectory\SomeFile3.txt
C:\SomeDirectory\SomeFile4.txt
C:\SomeDirectory\SomeFile5.txt