A simple powershell clone of the unix `grep` command

Select-StringAdvanced.ps1

function Select-StringAdvanced {
    Param (
        [Parameter(Mandatory=$True)][string]$Pattern,
        [Alias("f")][string[]]$Files,
        [Alias("a")][int]$AfterContext = 0,
        [Alias("b")][int]$BeforeContext = 0,
        [Alias("x")][int]$Context = 0,
        [string[]]$Include,
        [string[]]$Exclude,
        [Alias("c")][switch]$Count = $False,
        [Alias("e")][switch]$ExtendedRegexp = $False,
        [Alias("i")][switch]$IgnoreCase = $False,
        [Alias("v")][switch]$InvertMatch = $False,
        [Alias("q")][switch]$Quiet = $False,
        [Parameter(ValueFromPipeline)]$Input
    )
    $SSArgs = @{
        "Pattern" = $Pattern
        "SimpleMatch" = !$ExtendedRegexp
        "CaseSensitive" = !$IgnoreCase
        "NotMatch" = $InvertMatch
        "Quiet" = $Quiet
    }
    If ($Context) {
        $SSArgs.Context = $Context
    } Else {
        $SSArgs.Context = $BeforeContext,$AfterContext
    }
    If ($Files) {
        $SSArgs.Path = $Files
        If ($Include) {
            $SSArgs.Include = $Include
        }
        If ($Exclude) {
            $SSArgs.Exclude = $Exclude
        }
        Select-String @SSArgs
    } Else {
        $Input | Select-String @SSArgs
    }
}; Set-Alias grep Select-StringAdvanced