User-agent: *
Disallow:

#This one keeps all robots out.
#
#User-agent: *
#Disallow: /
#
#The next one bars all robots from the cgi-bin and images directories:
#
#User-agent: *
#Disallow: /cgi-bin/
#Disallow: /images/
#
#This one bans Roverdog from all files on the server:
#
#User-agent: Roverdog
#Disallow: /
#
#This one bans keeps googlebot from getting at the cheese.htm file:
#
#User-agent: googlebot
#Disallow: cheese.htm