how do 301 redirect from subdomain to main

[reza10]

I have a wordpress blog on example.com/blog with some articles and all contents are indexed in google.

now blog is moved to main example.com and blog folder is completely deleted. now how can i  do correct 301 redirects for google to keep my seo rank and prevent broken links in my google index.

[TomClarke]

Anytime the error 301 messages appear on your computer, it is due to corrupt or danaged system  files. If you do not fix this error immediately, it can lead to additional  system issues, blue screens and hardware problems. Frozen programs, installer errors, random shutdowns, system freezing and sluggish computer performance are common symptoms of the error 301. Fortunately, you can fix the error 301 with features native to your computer.
Click "Start" and then "Computer". Right-click "C" and select "Properties".
Select the "Tools" tab and click "Check now". Select  "Continue" if the user Account Control prompt displays.
Select the "Automatically Fix File System Errors" option and click "Start". Agree to reschedule the check for the ext system restart.
Reboot your system. Allow the check disk to detect and repair all Error 301 issues.

[RH-Calvin]

301 redirect is the most efficient and Search Engine Friendly method for webpage redirection. It's not that hard to implement and it should preserve your search engine rankings for that particular page. If you have to change file names or move pages around, it's the safest option. The code "301" is interpreted as "moved permanently".