OCR a pdf in OS X

gistfile1.txt

#User downloads a pdf but it's an image only document and the text cannot be searched
#open a terminal
#brew install tesseract (unless you already have it installed)
#open the document in Preview and export to a Tiff document (multipage is supported, 150dpi seems ok
#change to the file directory in terminal to save you the bother of putting the full path in
#tesseract filename.tiff outputfilename pdf
#tesseract then crunches through your file and creates an output file with the specified name and filetype