Wrap main code into main() to avoid globals

bin/dissect_url

@@ -9,15 +9,21 @@ dissect() {
     echo ""
 }
 
-if [[ -n "$1" ]]; then
-    dissect "$1"
-else
-    i=0
-    while read url;
-    do
-        if [[ -z "$url" ]]; then exit 0; fi
-        i=`expr $i + 1`
-        printf "=== url %02d =============================================\n" $i
+main() {
+    local url=$1
+    local i=0
+    if [[ -n "$url" ]]; then
         dissect "$url"
-    done
-fi
+    else
+        i=0
+        while read url;
+        do
+            if [[ -z "$url" ]]; then exit 0; fi
+            i=`expr $i + 1`
+            printf "=== url %02d =============================================\n" $i
+            dissect "$url"
+        done
+    fi
+}
+
+main "$@"