Hi,
Gopal, I don't want to offend You, but I think You should ask such a questions
on "fedora-list" instead of "fedora-laptop-list".
As summary on list index says:
"Fedora-laptop-list -> Laptop related things"
"fedora-list -> Community assistance, encouragement, and advice for using
Fedora."
Topics You are asking (use of cp, chmod, selinux, shell) are NOT laptop
specific.
regards,
--
jg