wordpress redirection help

how to redirect all pages of my website to homepage.
I want mysite.com/abcd to be redirected to mysite.com
but navigation bar should show mysite.com/abcd.
please somebody explain.

You can rewrite .htsaccess file

For example:
example.com/pages/page.htm ---> example.com
sub.example.com/page.htm ---> example.com
error.example.com/error ---> example.com

Or

You can try by using WordPress redirection plugin :

You can download here : wordpress.org/extend/plugins/redirection

Configuration steps:

wordpress.org/extend/plugins/redirection/installation
wordpress.org/extend/plugins/redirection/screenshots