> instead of |

gitstats

@@ -1583,8 +1583,8 @@ class GitStats:
         outputpath = os.path.abspath(args[-1])
 
         # execute git2json for top files
-        os.system("git2json | ~"+os.path.abspath(args[-1])+"/top_committed_files.json")
-        
+        os.system("git2json > ~"+os.path.abspath(args[-1])+"/top_committed_files.json")
+
         rundir = os.getcwd()
 
         try: