Added check-ipv4-address.ps1 and check-mac-address.ps1

Scripts/check-ipv4-address.ps1

@@ -0,0 +1,28 @@
+#!/snap/bin/powershell
+
+# Syntax:       ./check-ipv4-address.ps1 [<address>]
+# Description:	checks the given IPv4 address for validity
+# Author:	Markus Fleschutz
+# Source:	github.com/fleschutz/PowerShell
+# License:	CC0
+
+param([string]$Addr)
+
+# IPv4-Address like 192.168.178.1
+$RegEx = "^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
+
+try {
+	if ($Addr -eq "" ) {
+		$Addr = read-host "Enter IPv4 address to validate"
+	}
+	if ($Addr -match $RegEx) {
+		write-output "IPv4 address $Addr is valid"
+		exit 0
+	} else {
+		write-output "IPv4 address $Addr is NOT valid"
+		exit 1
+	}
+} catch {
+	write-error "ERROR in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
+	exit 1
+}