Invoke pdftotext tool to extract text from a PDF document

pdftotext(x, outfile = NULL, first = NULL, last = NULL,
  layout = FALSE, table = FALSE, raw = FALSE, ...)

Arguments

x	Path to PDF
outfile	Optional output file (defaults to <pdfstem.txt>)
first	Optional page to start conversion
last	Optional page to finish conversion
layout, table, raw	pdftotext options (all default `FALSE`)
...	additional arguments passed to `readLines` when `outfile=FALSE`

the return value of the system call or, if outfile has the signalling value of FALSE, the contents of the text file as a character vector.

Run pdftotext -help for details