如何通过URL重写规则实现301重定向

在设置301重定向之前务必备份相应目录下的.htaccess文件。(Windows主机是在/htdocs目录下,Linux主机是在根目录下)
1.重定向domain.com到www.domain.com
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www.domain.com$[NC]
RewriteRule ^(.*)$http://www.domain.com/$1 [L,R=301]
2.重定向www.domain.com到domain.com
RewriteEngine On
RewriteCond %{HTTP_HOST} !^domain.com$[NC]
RewriteRule ^(.*)$ http://domain.com/$1[L,R=301]
3.重定向olddomain.com到www.newdomain.com
RewriteEngine On
RewriteCond %{HTTP_HOST} !olddomain.com$[NC]
RewriteRule ^(.*)$http://www.newdomain.com/$1 [L,R=301]
4.重定向olddomain.com到newdomain.com
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} !olddomain.com$[NC]
RewriteRule ^(.*)$ http://newdomain.com/$1[L,R=301]
5.重定向domain.com/file/file.php到otherdomain.com/otherfile/other.php
RewriteEngine On
RewriteCond %{HTTP_HOST}^www.domain.com$
RewriteRule ^file/file.php$http://www.otherdomain.com/otherfile/other.php