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+====== BASH: Cara Memonitor Port Online atau Offline ======
+Berikut ini adalah script untuk memonitor port down atau online yang biasanya kita lakukan dengan telnet.
+<code>
+SERVER=gitlab.com
+PORT=22
+nc -z -v -w5 $SERVER $PORT
+result1=$?
+#Do whatever you want
+if [  "$result1" != 0 ]; then
+  echo  'port 22 is closed'
+else
+  echo 'port 22 is open'
+fi
+</code>
+Selamat mencoba.
+sumber : https://stackoverflow.com/questions/4922943/test-if-remote-tcp-port-is-open-from-a-shell-script