Fixed for stderr exit code

slpkg/utilities.py

@@ -157,10 +157,13 @@ class Utilities:
     def process(command: str, stderr=None, stdout=None) -> None:
         """ Handle the processes. """
         try:
-            subprocess.call(command, shell=True, stderr=stderr, stdout=stdout)
+            output = subprocess.call(command, shell=True, stderr=stderr, stdout=stdout)
         except (KeyboardInterrupt, subprocess.CalledProcessError) as err:
             raise SystemExit(err)
 
+        if output != 0:
+            raise SystemExit(output)
+
     def raise_error_message(self, message: str) -> None:
         """ A general method to raise an error message and exit. """
         raise SystemExit(f"\n{self.configs.prog_name}: {self.bred}Error{self.endc}: {message}.\n")