Day 2 part 1 soln

02/poop.sh

@@ -4,7 +4,9 @@ trap 'echo "SHIEEEET at line $LINENO" >&2' ERR
 
 main() {
     local line
-    line=$(< example.txt)
+    local sum=0
+    # line=$(< example.txt)
+    line=$(< input.txt)
 
     IFS=',' read -ra ranges <<< "$line"
 
@@ -12,9 +14,19 @@ main() {
         IFS='-' read -r start end <<< "$r"
 
         for ((i=start; i<=end; i++)); do
-            echo "$i"
+            if (( ${#i} % 2 == 0 )); then
+                left="${i:0:${#i}/2}"
+                right="${i:${#i}/2}"
+
+                if [[ "$left" == "$right" ]]; then
+                    echo "Match: $i"
+                    ((sum+=$i))
+                fi
+            fi
         done
     done
+    
+    echo "Sum: $sum"
 }
 
 main "$@"