WIP post-Codemash

Author: ryapric

linux/instructions/challenge_1.md

@@ -11,3 +11,5 @@ a Go binary.
 
 Take note of any error messages when trying to build it, and fix any issues you
 find.
+
+NOTE APP NEEDS TO BE CALLED `app`, NOT `main`

linux/instructions/challenge_4.md

@@ -24,4 +24,5 @@ look at the `/opt/app` directory again, you may have noticed that there is a
   correctly-installed app binary.
 
 Once you do that, be sure to check the `systemd` and/or `journald` logs of the
-new `app-deb.service` to make sure it's running successfully!
+new `app-deb.service` to make sure it's running successfully! (and, just like
+the last one, that it would keep running after a reboot)

linux/instructions/challenge_5.md

@@ -22,5 +22,7 @@ number is:
 
 1. *Not* `8080`
 
+1. *Not* managed by the `iptables` tool.
+
 Finally, you will want to figure out what firewall issue your own server has
 that seems to be causing problems, and fix it.

linux/scripts/linux-workshop-admin.sh

@@ -54,8 +54,8 @@ _score-for-challenge() {
 # challenges.
 _get-last-challenge-completed() {
   local last_challenge_completed
-  last_challenge_completed="$(find /home/appuser -type f -name '*.md' | grep -E -o '[0-9]+' | sort -h | tail -n1)"
-  max_possible_challenge_completed="$(find "${wsroot}"/instructions -type f -name '*.md' | grep -E -o '[0-9]+' | sort -h | tail -n1)"
+  last_challenge_completed="$(find /home/appuser -type f -name 'challenge_*.md' | grep -E -o '[0-9]+' | sort -h | tail -n1)"
+  max_possible_challenge_completed="$(find "${wsroot}"/instructions -type f -name 'challenge_*.md' | grep -E -o '[0-9]+' | sort -h | tail -n1)"
   if [[ -f /home/appuser/congrats.md ]] ; then
     last_challenge_completed="${max_possible_challenge_completed}"
   else