diff --git a/setup.cfg b/setup.cfg
index 35c5fabe..fc548903 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = compass
-version = 0.1.0
+version = attr: compass.__version__
 description = A Package to Generate Coregistered Multi-temporal SAR SLC
 long_description = file: README.md
 long_description_content_type = text/markdown
@@ -28,4 +28,3 @@ where = src
 [options.entry_points]
 console_scripts =
     s1_cslc.py = compass.s1_cslc:main
-
diff --git a/src/compass/__init__.py b/src/compass/__init__.py
index e69de29b..060593e9 100644
--- a/src/compass/__init__.py
+++ b/src/compass/__init__.py
@@ -0,0 +1,2 @@
+# get version info
+from compass.version import release_version as __version__
diff --git a/src/compass/s1_cslc.py b/src/compass/s1_cslc.py
old mode 100644
new mode 100755
index bb5906cd..eeced16c
--- a/src/compass/s1_cslc.py
+++ b/src/compass/s1_cslc.py
@@ -1,3 +1,7 @@
+#!/usr/bin/env python
+
+'''driver for CSLC workflow in radar/geo'''
+
 from compass import s1_rdr2geo, s1_geo2rdr, s1_resample, s1_geocode_slc
 from compass.utils.geo_runconfig import GeoRunConfig
 from compass.utils.runconfig import RunConfig
diff --git a/src/compass/s1_geo2rdr.py b/src/compass/s1_geo2rdr.py
old mode 100644
new mode 100755
index 566b69a9..dd0e3190
--- a/src/compass/s1_geo2rdr.py
+++ b/src/compass/s1_geo2rdr.py
@@ -1,4 +1,7 @@
-"""Wrapper for geo2rdr"""
+#!/usr/bin/env python
+
+'''wrapper for geo2rdr'''
+
 from datetime import timedelta
 import os
 import time
diff --git a/src/compass/s1_geocode_slc.py b/src/compass/s1_geocode_slc.py
old mode 100644
new mode 100755
index 693a8118..2d8c0cc5
--- a/src/compass/s1_geocode_slc.py
+++ b/src/compass/s1_geocode_slc.py
@@ -1,3 +1,7 @@
+#!/usr/bin/env python
+
+'''wrapper for geocoded SLC'''
+
 from datetime import timedelta
 import os
 import time
diff --git a/src/compass/s1_rdr2geo.py b/src/compass/s1_rdr2geo.py
old mode 100644
new mode 100755
index 66eb83a8..0367a9ad
--- a/src/compass/s1_rdr2geo.py
+++ b/src/compass/s1_rdr2geo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 
 '''wrapper for rdr2geo'''
 
diff --git a/src/compass/s1_resample.py b/src/compass/s1_resample.py
old mode 100644
new mode 100755
index a849a725..b31ad29e
--- a/src/compass/s1_resample.py
+++ b/src/compass/s1_resample.py
@@ -1,4 +1,7 @@
-"""Wrapper for resample burst"""
+#!/usr/bin/env python
+
+"""Wrapper for resample"""
+
 from datetime import timedelta
 import os
 import time
diff --git a/src/compass/utils/helpers.py b/src/compass/utils/helpers.py
index d249539c..83192491 100644
--- a/src/compass/utils/helpers.py
+++ b/src/compass/utils/helpers.py
@@ -25,7 +25,7 @@ def check_file_path(file_path: str) -> None:
         Path to file to be checked
     """
     error_channel = journal.error('helpers.check_file_path')
-    if not os.path.isfile(file_path):
+    if not os.path.exists(file_path):
         err_str = f'{file_path} not found'
         error_channel.log(err_str)
         raise FileNotFoundError(err_str)
diff --git a/src/compass/version.py b/src/compass/version.py
new file mode 100644
index 00000000..46580884
--- /dev/null
+++ b/src/compass/version.py
@@ -0,0 +1,16 @@
+# release history
+
+import collections
+
+
+# release history
+Tag = collections.namedtuple('Tag', 'version date')
+release_history = (
+    Tag('0.1.1', '2022-06-08'),
+    Tag('0.1.0', '2022-06-07'),
+)
+
+# latest release version number and date
+release_version = release_history[0].version
+release_date = release_history[0].date
+