How can I find which Homebrew package a certain file/binary belongs to (if any)? [duplicate]
If the file was installed by Homebrew, it is a symlink to a file in /usr/local/Cellar/:
$ ls -l /usr/local/share/info/bash.info
lrwxr-xr-x 1 admin wheel 45 Mar 15 15:25 /usr/local/share/info/bash.info -> ../../Cellar/bash/4.2.45/share/info/bash.info
It's also possible that the file was not installed by Homebrew. /usr/local/ is often the default installation target in makefiles, and it is also used by installers and by other package managers like pip.