minor style change after pulling from Enlik

z.sh

@@ -60,9 +60,7 @@ _z() {
     } else for( i in rank ) print i "|" rank[i] "|" time[i]
    }
   ' "$datafile" 2>/dev/null >| "$tempfile"
-  if [ $? -eq 0 ]; then
-    env mv -f "$tempfile" "$datafile"
-  fi
+  [ $? -eq 0 ] && env mv -f "$tempfile" "$datafile"
 
  # tab completion
  elif [ "$1" = "--complete" ]; then