fix bug with username

Author: tspicer

README.md

@@ -79,14 +79,25 @@ For more information on the above parameters, please check out the Slack docs:
 * https://api.slack.com/docs/attachments
 
 
-### Examples
+# Send A Message
 The channel is "general" with username "hacky-slack". The icon is "apple" and the author is "apple". The author name is linked to "apple.com" and the text sent in the message is "Where are the new 2016 Macbook models?"
 
 ```
 slack -c "#general" -u "hacky-slack" -i "apple" -a "Macbook" -b "http://www.apple.com/ -t "Where are the new 2016 Macbook models?"
 ```
 
-These examples assumes you have set your token and webhook endpoint.
+Here is a sample message and a screenshot of the message with various flags set.
+
+```
+slack -a -t "Hello World" -i ":slack:" -T "Titles are awesome" -p "Pretext is so helpful to include" -s "info"
+```
+
+Here is an example error message from Monit:
+
+![Generic Message Examples](icons/png/generic-message.png?raw=true "Generic INFO")
+
+
+Note: These examples assume you have set your token and webhook endpoint.
 
 ## Monit
 Monit is a system monitoring and recovery tool. More on Monit here: https://mmonit.com/monit/
@@ -143,9 +154,12 @@ check process crond with pidfile "/var/run/crond.pid"
       if 2 restarts within 3 cycles then exec /usr/bin/bash -c "sh /usr/local/bin/slack.sh -a -c #testing -s error -M monit" repeat every 3 cycles else if succeeded then exec /usr/bin/bash -c "sh /usr/local/bin/slack.sh -a -c #testing -s ok -M monit"
       if 5 restarts within 5 cycles then timeout
 ```
-## Using Hacky Slack in with other apps.
+### Using Hacky Slack in with other apps.
+
+Hacky Slack can be extended to support other applications besides Monit. For example, Nagios monitoring or Cron. Really, any application can send messages via Hacky Slack.
+
 
-Hacky Slack can be extended to support other applications. For example, Nagios monitoring or Cron. Really, any application can send messages via Hacky Slack.
+Since no user (<code>- u</code>) was specified it will default to using the host system IP address
 
 # Icons
 

icons/png/generic-message.png

@@ -184,13 +184,13 @@ else
    if test "${PRIORITY}" = "INFO"; then echo "INFO: STATUS (-s) was set to INFO..."; ICON=${ICON:-':info:'} && COLOR=${COLOR:-'#439FE0'}; fi
    if test "${PRIORITY}" = "WARN"; then echo "INFO: STATUS (-s) was set to WARN..."; ICON=${ICON:-':warn:'} && COLOR=${COLOR:-'#ed7d21'}; fi
    if test "${PRIORITY}" = "ERROR"; then echo "INFO: STATUS (-s) was set to ERROR..."; ICON=${ICON:-':error:'} && COLOR=${COLOR:-'#E21B6C'}; fi
+   if test -z "${USERNAME}"; then echo "INFO: A USERNAME (-u) was not specified for this POST to the Slack API. Setting a default username..."; USERNAME="${IP}"; fi
 
    # Set defaults
    test -z "${TEXT}"; echo "WARNING: You do not have any TEXT (-t) specified in the message."; TEXT="${TEXT:-'This message is missing TEXT'}"
    test -z "${TITLE}"; echo "WARNING: You do not have a TITLE (-T) specified for the message."; TITLE=${TITLE:-'This message is missing a TITLE'}
    test -z "${PRETEXT}"; echo "WARNING: You do not have a PRETEXT (-p) specified for the message."; PRETEXT=${PRETEXT:-'This message is missing a PRETEXT'}
    test -z "${CHANNEL}"; echo "WARNING: A CHANNEL (-c) was not set. Using the default CHANNEL..."; CHANNEL=${CHANNEL:-'general'}
-   test -z "${USERNAME}"; echo "INFO: A USERNAME (-u) was not specified for this POST to the Slack API. Setting a default username..."; USERNAME=${IP}
    test -z "${PRIORITY}"; echo "INFO: STATUS (-s) was not set. Setting a default STATUS to INFO..."; PRIORITY=${PRIORITY:-'INFO'} && ICON=${ICON:-':info:'} && COLOR=${COLOR:-'#439FE0'}
 
 fi
@@ -224,7 +224,7 @@ PAYLOAD="payload={ \
     \"title_link\": \"${TITLELINK}\", \
     \"text\": \"${TEXT}\", \
     \"mrkdwn_in\": [\"text\",\"pretext\",\"fields\"], \
-    \"fields\": [{\"title\": \"Status\",\"value\": \"${PRIORITY}\",\"short\": \"true\"}, {\"title\": \"Host\",\"value\": \"${IP}\",\"short\": \"true\"} ], \
+    \"fields\": [{\"title\": \"Status\",\"value\": \"${PRIORITY}\",\"short\": \"true\"}, {\"title\": \"Host\",\"value\": \"${USERNAME}\",\"short\": \"true\"} ], \
     \"image_url\": \"${IMAGE}\", \
     \"thumb_url\": \"${THUMBNAIL}\" \
 }]}"