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tschild - 10:05 am on Oct 30, 2003 (gmt 0)
Say you have the following files and directories: /index.html then you only need to specify User-agent: * to disallow those two directories, and leave snoopers in the dark about the names of the excluded directories.
Another option would be to specify disallowed directories with a partial path which is only long enough to not include allowed directories.
/my_sekrit_files/
/pages/
/sitemap.html
/stuff_that_i_dont_want_to_be_spidered/
Disallow: /m
Disallow: /st