start.sh improvement

start.sh

@@ -1,16 +1,16 @@
 #!/bin/sh
-
+LANG="C"
 
 cleanup() {
+  trap - INT EXIT TERM
   echo "[DPS] Cleaning up..."
-  pkill $backend_pid # pkill because subshells
-  pkill $frontend_pid
+  pgrep -P "$backend_pid" | xargs kill -TERM > /dev/null 2>&1
+  pgrep -P "$frontend_pid" | xargs kill -TERM > /dev/null 2>&1
   echo "[DPS] Cleaned up..."
   exit
 }
 
-# Trap INT (Ctrl+C)
-trap cleanup INT
+trap cleanup INT EXIT TERM
 echo "[DPS] trapped"
 
 cd ./00-backend
@@ -25,4 +25,5 @@ echo "[DPS] Frontend started with PID $frontend_pid"
 
 echo "[DPS] Ctrl+C to stop"
 # Wait for cleanup
-wait
+wait $backend_pid
+wait $frontend_pid