Improve uniq_path function

functions.sh

@@ -78,7 +78,7 @@ function remove_path() {
 }
 
 function uniq_path() {
-  echo "$PATH" | tr ":" "\n" | awk '!seen[$0]++' | tr "\n" ":" | sed -r 's/:+/:/g' | sed -r 's/^:|:$//g'
+  path | awk '!seen[$0]++' | tr "\n" ":" | sed -r 's/:+/:/g' | sed -r 's/^:|:$//g'
 }
 
 function set_uniq_path() {