diff --git a/lstchain/scripts/lstchain_add_source_dependent_parameters.py b/lstchain/scripts/lstchain_add_source_dependent_parameters.py
index 6c1936d658..78be5c6c71 100644
--- a/lstchain/scripts/lstchain_add_source_dependent_parameters.py
+++ b/lstchain/scripts/lstchain_add_source_dependent_parameters.py
@@ -42,10 +42,10 @@
                     default=None
                     )
 
-args = parser.parse_args()
-
 def main():
 
+    args = parser.parse_args()
+    
     dl1_filename = os.path.abspath(args.input_file)
 
     config = get_standard_config()
diff --git a/lstchain/scripts/lstchain_check_dl1.py b/lstchain/scripts/lstchain_check_dl1.py
index 63f8bead16..35f1614d8c 100755
--- a/lstchain/scripts/lstchain_check_dl1.py
+++ b/lstchain/scripts/lstchain_check_dl1.py
@@ -73,11 +73,10 @@
                       help='Run the script without plotting output'
                       )
 
-args, unknown = parser.parse_known_args()
-
 
 def main():
-
+    args, unknown = parser.parse_known_args()
+    
     logging.basicConfig(level=logging.INFO, format='%(message)s')
     logger = logging.getLogger(__name__)
 
diff --git a/lstchain/scripts/lstchain_dl1_muon_analysis.py b/lstchain/scripts/lstchain_dl1_muon_analysis.py
index 793ab3ccc0..af8c83be3b 100644
--- a/lstchain/scripts/lstchain_dl1_muon_analysis.py
+++ b/lstchain/scripts/lstchain_dl1_muon_analysis.py
@@ -3,8 +3,7 @@
 """
 Script to perform the analysis of muon events.
 
-- Inputs are a DL1a data file (pixel information is needed) and a
-calibration file
+- Inputs are a DL1a data file (pixel information is needed) and a calibration file
 - Output is a table with muon parameters (to be updated to a dataframe!)
 
 Usage:
@@ -81,11 +80,10 @@
     help="Maximum number of processed muon ring candidates",
 )
 
-args = parser.parse_args()
-
 
 def main():
-
+    args = parser.parse_args()
+    
     print("input files: {}".format(args.input_file))
     print("calib file: {}".format(args.calib_file))
     print("output file: {}".format(args.output_file))
diff --git a/lstchain/scripts/lstchain_mc_r0_to_dl1.py b/lstchain/scripts/lstchain_mc_r0_to_dl1.py
index eaedbf4150..dc6aecba70 100644
--- a/lstchain/scripts/lstchain_mc_r0_to_dl1.py
+++ b/lstchain/scripts/lstchain_mc_r0_to_dl1.py
@@ -43,11 +43,10 @@
                     default=None
                     )
 
-args = parser.parse_args()
-
 
 def main():
-
+    args = parser.parse_args()
+    
     output_dir = args.output_dir.absolute()
     output_dir.mkdir(exist_ok=True)
     output_file = output_dir / r0_to_dl1_filename(args.input_file.name)
diff --git a/lstchain/scripts/lstchain_mc_r0_to_dl2.py b/lstchain/scripts/lstchain_mc_r0_to_dl2.py
index 02482166f0..f814d91eda 100644
--- a/lstchain/scripts/lstchain_mc_r0_to_dl2.py
+++ b/lstchain/scripts/lstchain_mc_r0_to_dl2.py
@@ -14,10 +14,9 @@
 --path-models ./trained_models
 
 """
-
-from ctapipe.utils import get_dataset_path
 import argparse
 import os
+from ctapipe.utils import get_dataset_path
 from distutils.util import strtobool
 from lstchain.paths import r0_to_dl1_filename
 from pathlib import Path
@@ -53,10 +52,10 @@
                     default=None
                     )
 
-args = parser.parse_args()
-
 
 def main():
+    args = parser.parse_args()
+    
     outdir = args.outdir.absolute()
     dl1_file = outdir / r0_to_dl1_filename(args.datafile.name)
 
diff --git a/lstchain/scripts/lstchain_mc_rfperformance.py b/lstchain/scripts/lstchain_mc_rfperformance.py
index 6b9c20cafc..49f015185c 100644
--- a/lstchain/scripts/lstchain_mc_rfperformance.py
+++ b/lstchain/scripts/lstchain_mc_rfperformance.py
@@ -72,10 +72,10 @@
                     default=None
                     )
 
-args = parser.parse_args()
-
 
 def main():
+    args = parser.parse_args()
+    
     custom_config = {}
     if args.config_file is not None:
         try:
diff --git a/lstchain/scripts/lstchain_mc_sensitivity.py b/lstchain/scripts/lstchain_mc_sensitivity.py
index 8d662e51fc..c5891d6901 100644
--- a/lstchain/scripts/lstchain_mc_sensitivity.py
+++ b/lstchain/scripts/lstchain_mc_sensitivity.py
@@ -51,10 +51,10 @@
                     dest = 'output_path',
                     help = 'path where to save plot images')
 
-args = parser.parse_args()
-
 
 def main():
+    args = parser.parse_args()
+    
     ntelescopes_gamma = 1
     n_bins_energy = 20  #  Number of energy bins
     obstime = 50 * 3600 * u.s
diff --git a/lstchain/scripts/lstchain_mc_trainpipe.py b/lstchain/scripts/lstchain_mc_trainpipe.py
index 4b70240865..3f592282a4 100644
--- a/lstchain/scripts/lstchain_mc_trainpipe.py
+++ b/lstchain/scripts/lstchain_mc_trainpipe.py
@@ -50,10 +50,9 @@
                     default=None
                     )
 
-
-args = parser.parse_args()
-
 def main():
+    args = parser.parse_args()
+    
     #Train the models
         
     config = {}
diff --git a/lstchain/scripts/lstchain_merge_muon_files.py b/lstchain/scripts/lstchain_merge_muon_files.py
index 0f8a60e445..57d62341c3 100644
--- a/lstchain/scripts/lstchain_merge_muon_files.py
+++ b/lstchain/scripts/lstchain_merge_muon_files.py
@@ -46,10 +46,9 @@
                     default='*.fits',
 )
 
-args = parser.parse_args()
-
-
 def main():
+    args = parser.parse_args()
+    
     if args.run_number:
         run = f'Run{args.run_number:05d}'
         file_list = sorted(filter(
diff --git a/lstchain/scripts/lstchain_tune_nsb.py b/lstchain/scripts/lstchain_tune_nsb.py
index c03a683ad4..3d7814f7ba 100644
--- a/lstchain/scripts/lstchain_tune_nsb.py
+++ b/lstchain/scripts/lstchain_tune_nsb.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 """
 Usage:
 
@@ -42,10 +44,9 @@
         required=True,
 )
 
-args = parser.parse_args()
-
 
 def main():
+    args = parser.parse_args()
 
     if not args.config.is_file():
         log.error('Config file does not exist or is not a file')