diff --git a/libytest.so b/libytest.so
index 9deb47b..16c024f 100644
Binary files a/libytest.so and b/libytest.so differ
diff --git a/set_env.sh b/set_env.sh
index 6b8af45..7e384ba 100644
--- a/set_env.sh
+++ b/set_env.sh
@@ -1,20 +1,15 @@
 #!/bin/bash
-file_env=tempFILE
-if [ -e  "$file_env" ] ; then
-  rm "$file_env"
-fi
+
 if [ "$#" -le 0 ] ; then
+  echo "if need permanent config"
   echo "Usage: $0 file_name" >&2
   echo "for example: $0 ~/.bashrc" >&2
-  echo "or add these lines in bash profile for example: ~/.bashrc"
+  echo "or an other bash profile, here it is \"~/.bashrc\" for example"
+  export CPATH=$PWD/include_ytest/include:$CPATH
+  export LD_LIBRARY_PATH=$PWD:$LD_LIBRARY_PATH
 else
-  file_env=$1
-fi
-echo "export CPATH=$PWD/include_ytest/include:\$CPATH" >> $file_env
-echo "export LD_LIBRARY_PATH=$PWD:\$LD_LIBRARY_PATH" >> $file_env
-
-if [ "$#" -le 0 ] ; then
-  cat $file_env
-  rm $file_env
+  echo "export CPATH=$PWD/include_ytest/include:\$CPATH" >> $1
+  echo "export LD_LIBRARY_PATH=$PWD:\$LD_LIBRARY_PATH" >> $1
+  source $1
 fi
 
diff --git a/unset_env.sh b/unset_env.sh
index a9f0220..a67a61e 100644
--- a/unset_env.sh
+++ b/unset_env.sh
@@ -1,17 +1,11 @@
 #!/bin/bash
-file_env=tempFILE
-if [ -e  "$file_env" ] ; then
-  rm "$file_env"
-fi
 if [ "$#" -le 0 ] ; then
-  echo "Usage: $0 file_name" >&2
+  LD_LIBRARY_PATH=$(echo $LD_LIBRARY_PATH | sed "s@$PWD:@@g")
+  CPATH=$(echo $CPATH | sed "s@$PWD/include_ytest/include:@@g")
+  echo "If need permanent unset env "
+  echo "Usage: $0 file_name"
   echo "for example: $0 ~/.bashrc" >&2
-  echo "or remove these lines in bash profile (for example: ~/.bashrc) th file you have set whith set_env.sh"
-  echo "export CPATH=$PWD/include_ytest/include:\$CPATH" >> $file_env
-  echo "export LD_LIBRARY_PATH=$PWD:\$LD_LIBRARY_PATH" >> $file_env
-
-  cat $file_env
-  rm $file_env
+  echo "or other bash profile ( here : \"~/.bashrc\" for example), the same file you have set whith set_env.sh"
 fi