Get the number of pages in a PDF document

Question

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Many hours have I searched for a fast and easy, but mostly a

Answer 1

The R package pdftools and the function pdf_info() provides information on the number of pages in a pdf.

library(pdftools)
pdf_file <- file.path(R.home("doc"), "NEWS.pdf")
info <- pdf_info(pdf_file)
nbpages <- info[2]
nbpages

$pages
[1] 65