robots.txt help

Where should I put robots.txt and where would it apply to?

/var/www/html is to the main site
/var/www/XXX is to XXX.mainsite.com

So, my question is, would I need robots.txt in the sub-domain directory in addition to the main site?



Also, in robots.txt placed in /var/www/html
would
--CODE
Disallow: /images
--CODE
Would that disallow access to /var/www/html/images or to /images?

 

 

 

 

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