small fixes

README.md

@@ -1,7 +1,23 @@
-= Wait for it
+=Wait for it=
 
 wait-for-it.sh is a pure bash script that wait on the availability of a host and TCP port.  It is useful for synchronizing the spin-up of interdependent services, such as linked docker containers.  Since it is a pure bash script, it does not have any external dependencies.
 
+==Usage==
+
+```
+wait-for-it.sh host:port [-s] [-t timeout] [-- command args]
+-h HOST | --host=HOST       Host or IP under test
+-p PORT | --port=PORT       TCP port under test
+                            Alternatively, you specify the host and port as host:port
+-s | --strict               Only execute subcommand if the test succeeds
+-q | --quiet                Don't output any status messages
+-t TIMEOUT | --timeout=TIMEOUT
+                            Timeout in seconds, zero for no timeout
+-- COMMAND ARGS             Execute command with args after the test finishes
+```
+
+==Examples==
+
 For example, let's test to see if we can access port 80 on www.google.com, and if it is available, echo the message "Let's start googling!"
 
 ```

wait-for-it.sh

@@ -63,7 +63,7 @@ wait_for_wrapper()
 }
 
 # process arguments
-while [[ $# -ne 0 ]]
+while [[ $# -gt 0 ]]
 do
     case "$1" in
         *:* ) 
@@ -86,6 +86,7 @@ do
         ;;
         -h) 
         HOST="$2"
+        if [[ $HOST == "" ]]; then break; fi
         shift 2
         ;;
         --host=*) 
@@ -94,6 +95,7 @@ do
         ;;
         -p)
         PORT="$2"
+        if [[ $PORT == "" ]]; then break; fi
         shift 2
         ;;
         --port=*)
@@ -102,6 +104,7 @@ do
         ;;
         -t)
         TIMEOUT="$2"
+        if [[ $TIMEOUT == "" ]]; then break; fi
         shift 2
         ;;
         --timeout=*)