add notes 04-yaml, move homework 4.1 to subdirectory

src/homework/04-script/4.1/q4_script.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+serverPort=80
+servers=("192.168.0.1" "173.194.222.113" "87.250.250.242")
+
+for i in {1..5}
+do
+  isError=0
+  for server in ${servers[@]}
+  do
+    curl --connect-timeout 3 --max-time 5 http://${server}:${serverPort}
+    curlResult=$?
+    echo "$(date) curl result for ${server} is ${curlResult}" >> curl.log;
+    if (($curlResult!=0))
+    then
+      echo ${server} > error.log
+      isError=1
+      break
+    fi
+  done
+
+  if (($isError!=0))
+  then
+    echo "going to break"
+    break
+  fi
+done