Index your scanned documents.

To install scandex itself

gem install scandex

In order to index files though, scandex relies on imagemagick, ghostscript and tesseract.

brew install imagemagick gs tesseract

To add documents to the index

scandex index ~/Documents/*.pdf

To search for documents

scandex search "Taxes"

To list documents

scandex list

You can also have scandex just watch a directory for incoming new documents

scandex watch ~/Documents/Scanner

By default scandex stores its index in $HOME/.scandex.db but you can use -f PATH to specify where the database should be stored instead.