Added install.sh

install.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# install.sh / uninstall.sh — Custom MOTD installer
+# Symlink or rename this file; behaviour switches on the script name.
+set -euo pipefail
+
+TARGET="/etc/profile.d/motd.sh"
+MOTD_D="/etc/update-motd.d"
+
+if [[ $EUID -ne 0 ]]; then
+  echo "Error: run as root (sudo $0)" >&2
+  exit 1
+fi
+
+if [[ ! -f "motd.sh" ]]; then
+  echo "Error: motd.sh not found in current directory" >&2
+  exit 1
+fi
+echo "Installing $TARGET..."
+cp motd.sh "$TARGET"
+chmod +x "$TARGET"
+echo "Disabling default MOTD scripts..."
+chmod -x "$MOTD_D"/*
+echo "Done. Test with: bash $TARGET"