记录一个报错，修改wordpress的/var/www/.htaccess文件中，不慎改了什么。打开网站显示
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at webmaster@localhost to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log..htaccess文件引起，解决办法
1、删除.htaccess文件，（记得备份）
2、复制网页目录/var/www/.htaccess.bk文件为/var/www/.htaccess文件,修改所有者。
3、再次打开网页正常，追加之前添加的部分代码，正常，问题解决。
重点：常备份文件（做好备份）。