htaccess redirect to maintenance page but not if they want a page inside of specific folders

Dear Experts,

I am needing to do a few updates on the public portion of my site and need to redirect traffic using htaccess to a maintenance page while I update the pages,  I don't really know where to begin. I am hoping it wont be to complicated but what I need to do is this:

redirect all traffic to a maintenance page called "update.php" unless they need access to a page inside of a folder called "cora" or "member". Also I would like to allow them access to the login and the logout page which is "login.php" and "logout.php"

Also I would still like to allow myself access to the site while I test to make sure the update is working correctly. So I would need to allow my ip address have access to everything.

Many thanks as always
LightwalkerAsked:
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Steve BinkCommented:
Make sure you have mod_rewrite in your Apache installation.  You can see the docs for more information on the directives:

http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html

Something like this should work you:

RewriteCond %{REQUEST_FILENAME} !^/(cora|member)/ [NC]
RewriteCond %{REQUEST_FILENAME} !^/?log(in|out)\.php$ [NC]
# your ip goes on the next line
RewriteCond %{REMOTE_ADDR} !000\.000\.000\.000
RewriteRule ^/?(.*)$ update.php [L]

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