diff --git a/pyproject.toml b/pyproject.toml
index 1041e4c..e6f9d1d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rda_python_common"
-version = "1.0.14"
+version = "1.0.15"
 authors = [
   { name="Zaihua Ji", email="zji@ucar.edu" },
 ]
diff --git a/src/rda_python_common/PgLOG.py b/src/rda_python_common/PgLOG.py
index 72363a4..93cc8dd 100644
--- a/src/rda_python_common/PgLOG.py
+++ b/src/rda_python_common/PgLOG.py
@@ -109,6 +109,7 @@
    'DSIDCHRS' : "d",
    'DOSHELL' : False,
    'NEWDSID' : True,
+   'PUSGDIR' : None,
    'BCHHOSTS' : "PBS",
    'HOSTTYPE' : 'dav',    # default HOSTTYPE
    'EMLMAX' : 256,       # up limit of email line count 
@@ -479,6 +480,13 @@ def get_call_trace(cut = 1):
 
    return str + "\n" if str else ""
 
+#
+# get caller file name
+#
+def get_caller_file(cidx = 0):
+
+   return traceback.extract_stack()[cidx][0]
+
 #
 # log message, msg, for degugging processes according to the debug level 
 #
@@ -556,6 +564,7 @@ def set_help_path(progfile):
 #
 def show_usage(progname, opts = None):
 
+   if PGLOG['PUSGDIR'] is None: set_help_path(get_caller_file())
    usgname = join_paths(PGLOG['PUSGDIR'], progname + '.usg')
 
    if opts:
@@ -1284,7 +1293,6 @@ def set_common_pglog():
    SETPGLOG("DRDATAEP", "rda-quasar-drdata")            # DRDATA Globus Endpoint on Quasar
    SETPGLOG("DBGFILE", "pgdss.dbg")                     # debug file name
    SETPGLOG("CNFPATH", PGLOG['DSSHOME']+"/config")      # path to configuration files
-   SETPGLOG("PUSGDIR", PGLOG['DSSDBHM']+"/prog_usage")  # path to program usage files
    SETPGLOG("DSSURL",  "https://rda.ucar.edu")          # current dss web URL
    SETPGLOG("RQSTURL", "/datasets/request")              # request URL path
    SETPGLOG("WEBSERVERS", "rda-web-prod01.ucar.edu:rda-web-test01.ucar.edu")                 # webserver names for Web server