Hi choroba, Its working but i have one problem with this script, it adding information how many times sting found in c file. But i need to add only once.for example if temperature string found three times in c file, so it adding same information three times. if string found add information at once is enoghf. no need to add same information so many times(how many times string presents).because in my file i have repeated strings so its aadding same information several times. how can i rectify this.