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A comment on Google Recently Made A Silent Shift To A New Search Algorithm, “Hummingbird”. Parent comment

Re:Google Recently Made A Silent Shift To A New Search Algor... by eieio on Thursday September 26, 2013 @06:00PM (#6453906)
file: doesn't appear to be a documented command, while filetype is [1]

Searching for a few random queries with either "file:pdf" or "filetype:pdf" shows that both return pdfs, but the results that I get are different. Not sure what to make of that or which is better.

[1] http://www.googleguide.com/using_advanced_operators.html

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Re:Google Recently Made A Silent Shift To A New Search Algor... by James_Duval on Friday September 27, 2013 @06:16AM (#6456230)
For me, "file:pdf" returns .pdfs, .pdf documentation, .pdf information...all kinds of things which aren't .pdf.

"filetype:pdf" seems to be the only command which reliably returns just .pdfs.

I'm in the UK, your mileage may vary.

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