I am trying to create a script which should run using parameter and without parameter should result for for multiple list: Ex: I have a function under which I gave param as servername which is working fine for single server ad fetching the results. (RestoreFileList -servername XXXXXXXXXXX1)

If I do not want to give a parameter as servername and output should result full set of servers list data Ex : Restorefilecount

Am i missing something between parameter and serverlist condition which should fetch the results, Any help on this?

Script *************

function Restorefilecount()
{
[cmdletbinding()]
param(
[Parameter(position = 0,mandatory = $false)]
[string] $Servername
)
$servername = @()
$servername = ('XXXXXXXX1', 'XXXXXXXXX2', 'XXXXXXXXX3', 'XXXXXXXXXX4')
$result = Invoke-Client -ComputerName $Servername -ScriptBlock {
$Server = HOSTNAME.EXE
$Query = @'
Select @@ServerName AS ServerName , name,(SUBSTRING(NAME ,15,3) * 100 ) / 100 AS 
file,state_desc,user_access_desc FROM master.sys.databases where name like 'TKT' ORDER BY 2
'@
Invoke-Sqlcmd -ServerInstance $Server -Database master -Query $Query
}

CodePudding user response：

Building on Abraham Zinala's helpful comments:

It looks like you're simply looking to define a parameter's default value:

function Restore-FileCount {
  [CmdletBinding()]
  param(
    [string[]] $Servername = @('XXXXXXXX1', 'XXXXXXXXX2', 'XXXXXXXXX3', 'XXXXXXXXXX4')
  )
  # ...
  $Servername # Output for demo purposes
}

Note how the parameter type had to be changed from [string] to [string[]] in order to support an array of values.

Incidental changes:

• Since you're using a param(...) block to define your parameters (which is generally preferable), there is no need to place () after the function name (Restorefilecount()) - while doing so doesn't cause a syntax error as long as there's nothing or only whitespace between ( and ), note that you declare parameters either via a param(...) block or via function foo(...); also, in parameter-less functions () is never needed - see the conceptual about_Functions help topic.

• I've inserted a hyphen (-) in your function name, to make it conform to PowerShell's naming convention.

• I've omitted [Parameter(position = 0, mandatory = $false)], because what this attribute instance specifies amounts to the default behavior (all parameters are non-mandatory by default, and Position=0 is implied by $ServerName being the first (and only) parameter).