# Hosts File String Removal - Single Domain
# Removes a certain line on every Non-Server Domain PC via UNC.
# Run as Administrator

# Gets search string to match in hosts file. Sets Hosts file names and Network Paths
$Pattern = Read-Host -Prompt "Input Hosts File Search String"
$HostsPath = '\C$\windows\System32\drivers\etc\'
$TimeStamp = (Get-Date).ToString('yyyy-MM-dd_-_mm-ss')

$OriHostsName = 'hosts'
$HostsBakName = 'hosts_-_' + $Timestamp
$TempHostsName =  'hosts2'

$OriHostsFN = $HostsPath + $OriHostsName
$TempHostsFN = $HostsPath + $TempHostsName

# Gets List of Local Domain's Computers for all OUs. (Could add OU filter if req)
$ComputerList = Get-ADComputer -filter { OperatingSystem -notLike '*Windows Server*' }

ForEach ($Computer in $ComputerList)
{
    # Gets Content of hosts file, assigns to var. Sets Out File Name/Path.
    $Content = Get-Content "\\$($Computer.Name)$($OriHostsFN)"
    $WriteFile = "\\$($Computer.Name)$($TempHostsFN)"

    # If the $Pattern matches, $Content proceed with changes.
    if ($Content -like "*$($Pattern)*")
    {
        # Writes all lines excluding those containing $Pattern to new file.
        $NewContent = $Content | Select-String -pattern $Pattern -notmatch
        [IO.File]::WriteAllLines($WriteFile,$NewContent)

        # Renames original hosts file,  then renames our new file.
        Rename-Item -path "\\$($Computer.Name)$($OriHostsFN)" -newname $HostsBakName
        Rename-Item -path "\\$($Computer.Name)$($TempHostsFN)" -newname $OriHostsName
    }
}