- The script now cleanup PATH and LIBRARY_PATH from old addons

        - This allow for a clean reload of the nptool.sh script
        - user can switch between nptool version within a given bash
        sesssion

nptool.sh

 #! /bin/bash
 
+# remove a given directory to PATH
+function np_path_remove {
+  # Delete path by parts so we can never accidentally remove sub paths
+  PATH=${PATH//":$1:"/":"} # delete any instances in the middle
+  PATH=${PATH/#"$1:"/} # delete any instance at the beginning
+  PATH=${PATH/%":$1"/} # delete any instance in the at the end
+}
+
+# remove a given directory to LD_LIBRARY_PATH
+function np_ld_remove {
+  # Delete path by parts so we can never accidentally remove sub paths
+  LD_LIBRARY_PATH=${LD_LIBRARY_PATH//":$1:"/":"} # delete any instances in the middle
+  LD_LIBRARY_PATH=${LD_LIBRARY_PATH/#"$1:"/} # delete any instance at the beginning
+  LD_LIBRARY_PATH=${LD_LIBRARY_PATH/%":$1"/} # delete any instance in the at the end
+}
+# remove a given directory to DYLD_LIBRARY_PATH
+function np_dyld_remove {
+  # Delete path by parts so we can never accidentally remove sub paths
+  DYLD_LIBRARY_PATH=${DYLD_LIBRARY_PATH//":$1:"/":"} # delete any instances in the middle
+  DYLD_LIBRARY_PATH=${DYLD_LIBRARY_PATH/#"$1:"/} # delete any instance at the beginning
+  DYLD_LIBRARY_PATH=${DYLD_LIBRARY_PATH/%":$1"/} # delete any instance in the at the end
+}
+
+
   CMD="export"
   SEP="="
 
@@ -30,6 +54,21 @@ else
    exit 1
 fi
 
+# if NPTOOL already exist, remove old path from PATH and LIBRARY_PATH
+if [ ! -z "{$NPTOOL}" ];
+then
+  np_path_remove ${NPTOOL}/NPLib/bin
+  np_path_remove ${NPTOOL}/NPSimulation/bin
+  if [ "${NPARCH}" = "Darwin" ] ; 
+  then 
+  np_dyld_remove ${NPTOOL}/NPLib/lib
+  np_dyld_remove ${NPTOOL}/NPSimulation/lib
+  else
+  np_ld_remove ${NPTOOL}/NPLib/lib
+  np_ld_remove ${NPTOOL}/NPSimulation/lib
+  fi
+fi
+
 # export NPTOOL environment variable
 ${CMD} NPTOOL${SEP}$SCRIPTPATH