Day two: not much to do here, so I made a fun prompt script.

day2_exitcodeprompt.sh

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+#!/bin/bash
+
+#
+#   Day 2 - Generate Inventory
+#   "Pimp my prompt" with the return value of the last command.
+#   source this from ~/.bashrc or similar to modify PS1 to show the return value of previous command.
+#   Use the "demojify" command to restore your previous prompt after sourcing.
+
+PS1OLD=$PS1
+
+exitprompt ()
+{
+    ERROR="$?"
+    if [ "$ERROR" -eq 0 ]
+    then
+        COLORCODE=32 # foreground green
+        EMOJI="🙂"
+    else
+        COLORCODE=31 # foreground red
+        EMOJI="🙁"
+    fi
+    echo -e "\e[${COLORCODE}m${ERROR}${EMOJI}\e[0m"
+}
+
+demojify ()
+{
+    PS1=$PS1OLD
+}
+
+PS1="$PS1 \$(exitprompt)$ "
+

test_error.sh

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+#!/bin/bash
+
+# Returns a non-zero exit code on purpose to test the day 2 error prompt.
+
+exit 42
+