Added Files

Powershell/Scripts/check-mac-address.ps1

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+<#
+.SYNTAX       check-mac-address.ps1 [<MAC>]
+.DESCRIPTION  checks the given MAC address for validity
+              MAC address like 00:00:00:00:00:00 or 00-00-00-00-00-00 or 000000000000
+.LINK         https://github.com/fleschutz/PowerShell
+.NOTES        Author: Markus Fleschutz / License: CC0
+#>
+
+param($MAC = "")
+
+function IsMACAddressValid { param([string]$mac)
+	$RegEx = "^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})|([0-9A-Fa-f]{2}){6}$"
+	if ($mac -match $RegEx) {
+		return $true
+	} else {
+		return $false
+	}
+}
+
+try {
+	if ($MAC -eq "" ) {
+		$MAC = read-host "Enter MAC address to validate"
+	}
+	if (IsMACAddressValid $MAC) {
+		write-host -foregroundColor green "OK - MAC address $MAC is valid"
+		exit 0
+	} else {
+		write-warning "Invalid MAC address: $MAC"
+		exit 1
+	}
+} catch {
+	write-error "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
+	exit 1
+}