There is a file A.lcf.
I am updating the file and saving it .
But as soon as I am logging off and then logging in I am finding that the updated changes are not there in the file.
please post
ls -al file
how did you save the file in vi ?
Are you sure no other process is working on it ?
try lsof on that file
I saved it with :wq
Did you get a chance to try out what I had suggested ? 