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Google Search Dork: filetype:bak inurl:"htaccess|passwd|shadow|htusers"
This will search for backup files (*.bak) created by some editors or even by the administrator himself (before activating a new version). Every attacker knows that changing the extenstion of a file on a webserver can have ugly consequences.
filetype:bak inurl:"htaccess|passwd|shadow|htusers" Google Dork Source : filetype:bak inurl:"htaccess|passwd|shadow|htusers"