How to pass more than one input - powershell

Question

I'm trying to write a PowerShell script which will take particular extension files from different servers. To pass many extensions I know we can use # followed by extension. When I pick them from an input file and pass it on the script, it doesn't work.
$ServerName=Get-content "D:\HOMEWARE\BLRMorningCheck\Jerry\servername.txt"
foreach ($server in $ServerName)
{
$server_host=echo $server | %{$data = $_.split(";"); Write-Output "$($data[0])"}
$Targetfolder=echo $server | %{$data = $_.split(";"); Write-Output "$($data[1])"}
$Ext=echo $server | %{$data = $_.split(";"); Write-Output "$($data[2])"}
$Extension =#($Ext)
$Targetfolder=$Targetfolder.Trim('"')
$Files = Get-Childitem $TargetFolder -Include $Extension -Recurse
echo $Files
}
My extensions are *.log, *.log*7z, *.txt*7z, *.txt*.

Answer 1

$Ext contains a string, probably with a comma-separated list of extensions. However, a comma-separated string doesn't turn into an array (which is what the -Include parameter expects) just because you put it in #(). You need to split the string at the delimiter character:
PS C:\> $Ext = ".log,.log*7z,*.txt*7z,.txt"
PS C:\> $Ext
.log,.log*7z,*.txt*7z,.txt
PS C:\> $Extension = $Ext -split ','
PS C:\> $Extension
.log
.log*7z
*.txt*7z
.txt
Also, like I said in my answer to your previous question, you're probably better off using Import-Csv for reading your input file:
$filename = 'D:\HOMEWARE\BLRMorningCheck\Jerry\servername.txt'
Import-Csv $filename -Delimiter ';' -Header 'ComputerName', 'TargetFolder', 'Ext' |
select TargetFolder, #{n='Extensions';e={$_.Ext -split ','}} |
% { Get-Childitem $_.TargetFolder -Include $_.Extensions -Recurse }

Answer 2

#Ansgar has a the correct approach but in case you're new to powershell the more basic syntax below might be easier to understand. If you already know what file extensions you're looking for you don't need to get them from the file, just create an array that contains them.
$exts = "*.log",".log*7z","*.txt*7z","*.txt"
$servers = Get-Content "D:\HOMEWARE\BLRMorningCheck\Jerry\servername.txt"
foreach ($server in $servers) {
$host = $($server.split(';'))[0]
$targetFolder = $($server.split(';'))[1]
$files = Get-Childitem $targetFolder -Include $exts -Recurse
foreach($f in $files) {
Write-Output $f.fullname
}
}