Improve day 2

02/01.sh

@@ -3,16 +3,19 @@
 depth=0
 horizontal=0
 while read current; do
-  if [[ "$current" == "down "* ]]; then
-    current_tmp=${current/down /}
-    depth=$((depth+current_tmp))
-  elif [[ "$current" == "up "* ]]; then
-    current_tmp=${current/up /}
-    depth=$((depth-current_tmp))
-  elif [[ "$current" == "forward "* ]]; then
-    current_tmp=${current/forward /}
-    horizontal=$((horizontal+current_tmp))
-  fi
+  case "$current" in
+    "down "*)
+      current_tmp=${current/down /}
+      depth=$((depth+current_tmp))
+      ;;
+    "up "*)
+      current_tmp=${current/up /}
+      depth=$((depth-current_tmp))
+      ;;
+    "forward "*)
+      current_tmp=${current/forward /}
+      horizontal=$((horizontal+current_tmp))
+  esac
 done
 
 echo $((depth*horizontal))