Hi i am am monitioring a file every 60 seconds and checking if the file has changed and if it has changed i append the changes to another file. i am able to monitior the change in file size but i have a problem copying the changes made in the file to another file. i am using lseek to seek the last position of the file before changes were made

if the changes made to the file that is monitored is only update at the end ... (appending )

then with
file size of the unmodified file x
and the size of modified file y

then append ( y -x ) bytes to the new file by positioning the file pointer in the modified file directly to (x + 1)th byte