Reading a file

 
$lines=Get-Content myfile.txt
    $lines |
     ForEach-Object{
         Test-Connection  $_.Split(' ')[1]
     }
 
 
$lines=Get-Content myfile.txt
    $lines |
     ForEach-Object{
         Write-Host  $_
     }

http://technet.microsoft.com/en-us/library/ee692806.aspx Reading particular lines from a file