Add script to check for updates

check-updates.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# Uncomment for debugging use
+# set -o xtrace
+set -o errexit
+set -o pipefail
+set -o nounset
+
+PREV_RELEASE="8.0.1"
+
+LATEST_RELEASE=$(curl --silent https://www.netacad.com/courses/packet-tracer/faq | \
+    grep --only-matching --perl-regexp "What’s new in Packet Tracer \d\.\d\.\d" | \
+    head -1 | \
+    grep --only-matching --perl-regexp '\d\.\d\.\d')
+
+if [[ "${LATEST_RELEASE}" != "${PREV_RELEASE}" ]]; then
+    echo "There's a new release of Packet Tracer."
+    echo "https://www.netacad.com/courses/packet-tracer/faq"
+    echo "${LATEST_RELEASE} > ${PREV_RELEASE}."
+else
+    echo "There's no new release of Packet Tracer."
+    echo "https://www.netacad.com/courses/packet-tracer/faq"
+    echo "${LATEST_RELEASE} == ${PREV_RELEASE}."
+fi