Replace all occurrences of a string in a directory

MassReplace.ps1

function MassReplace {
    param (
        [Parameter(Mandatory=$true)] [string] $Path,
        [Parameter(Mandatory=$true)] [string] $Include,
        [Parameter(Mandatory=$true)] [string] $FindString,
        [Parameter(Mandatory=$true)] [string] $ReplaceString
    )
    Get-ChildItem $Path -Include $Include -Recurse
    | Select-String $FindString -SimpleMatch
    | Group-Object -Property Path
    | ForEach-Object {
        (Get-Content -LiteralPath $_.Name -Raw).Replace($FindString, $ReplaceString)
        | Set-Content -NoNewline -LiteralPath $_.Name
    }
}