modify set and unset env

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