[T2DMan]

Per Matt Cutts, Google is good at following 301 redirects, and using them to track old url's to new url's. I recommend them when url's are being changed, not just when you are moving to a new webhost.

http://www.mattcutts.com/blog/moving-to-a-new-web-host/

the recommended way to do it is to put a 301 (permanent) redirect on every page on mattcutts.com to point to the corresponding page on someotherdomain.com. If you can map mattcutts.com/url1.html to someotherdomain.com/url1.html, that’s better than doing a redirect just to the root page (that is, from mattcutts.com/url1.html to someotherdomain.com). In the olden days, Googlebot would immediately follow a 301 redirect as soon as it found it. These days, I believe Googlebot sees the 301 and puts the destination url back in the queue, so it gets crawled a little later.

For details regarding ASP check out ASP 301 redirects

[T2DMan]

php code - Without the first line, the redirect becomes the bad 302 redirect

If you are doing it via htaccess, have a look at the following thread - for non www to www 301 redirects

[PHP] if (PHP_VERSION >= '4.3.0')
{
header("Location: $url", 0, 301);
}
else if (SAPI_NAME == 'cgi' OR SAPI_NAME == 'cgi-fcgi')
{
header("Location: $url");
// Call the status header after Location so we are sure to wipe out the 302 header sent by PHP
header('Status: 301 Moved Permanently');
}
else
{
header("Location: $url");
header('HTTP/1.1 301 Moved Permanently');
}
[/PHP]

[T2DMan]

Here is a quick and dirty htaccess to convert underscores to dashes in your url's.

#Underscore to dashes 
hackRewriteRule ([^_]*)_([^_]*)_([^_]*)_([^_]*)_(.*)\.html$ $1-$2-$3-$4-$5.html [R=301,L] 
RewriteRule ([^_]*)_([^_]*)_([^_]*)_(.*)\.html$ $1-$2-$3-$4.html [R=301,L] 
RewriteRule ([^_]*)_([^_]*)_(.*)\.html$ $1-$2-$3.html [R=301,L] 
RewriteRule ([^_]*)_(.*)\.html$ $1-$2.html [R=301,L]
RewriteCond %{REQUEST_URI} ^// 
RewriteRule /(.*) $1

[mandar-seo]

Thanks for the code. Can you give some information about .htaccess.
With regards,
Mandar Thosar

[T2DMan]

I am not giving away links from good pages for such an unspecific request. What is your question, what specific information are you wanting?

[0AAA]

Thanks for the info-- I have beenlooking for this for some time as I saw many site's PR get divided. I think with 301 redirect helps to concentrate PR value at the same URL.

Recently --I did a URL Preference with Google for one of my site. Are these two the same?
Sorry --if I am bothering--but I am very ignorant on codes and server management.
Regards

[T2DMan]

Originally Posted by 0AAA

Thanks for the info-- I have beenlooking for this for some time as I saw many site's PR get divided. I think with 301 redirect helps to concentrate PR value at the same URL.

Recently --I did a URL Preference with Google for one of my site. Are these two the same?
Sorry --if I am bothering--but I am very ignorant on codes and server management.
Regards

The Google preference only means that you will get one preference showing up on Google results. You will still rather likely have Google PR on the other url. All the links going to that url will not be counting for your website.

I had a strange instance last week where a client gave the Google preference for non www, yet had an htaccess redirecting to the www version. Now you can see why Google calls it a preference. In that case, it would be likely that either Google got rather confused, or it overrode the preference, and just used the www version.

Combining all Google PR and text link votes into one version of the url means you actually get the best. Then you also set the google preference for the same version. Also means you are doing things right for the other search engines as well.

[0AAA]

Thanks again-
Actually I have built links without WWW but a bit worried--if other people link it they might unknowingly add WWW.
Anyway--I should not rely on others and should build links myself!

[khanshab]

This is the .htaccess file should be in the DocumentRoot directory for your web site.

The .htaccess file contains two columns. The first column is what you want redirected and the second column is where you want it redirected to.

For example, to redirect an entire web site to another site:

Redirect 301 / http://www.example.com/Example Web Page

Or, to redirect just one page to another page:

Redirect 301 /old-page.shtml http://www.example.com/new-page.shtml

[seopositive2]

So google use this technique also i care about this.