Remove the last page of a pdf file using PDFtk?

Can someone please tell me how to remove the last page of a PDF file, using PDFtk?

This will create the outfile.pdf with all but the last page in infile.pdf

pdftk infile.pdf cat 1-r2 output outfile.pdf

Explanation of parameters

• infile.pdf is the original pdf file
• cat is the operation
• 1-r2 is the page range
  • > You can reference page numbers in reverse order by prefixing them with the letter r. For example, page r1 is the last page of the document, r2 is the next-to-last page of the document, and rend is the first page of the document. You can use this prefix in ranges, too, for example r3-r1 is the last three pages of a PDF.
• output will output it to a specific file
• output.pdf is the output pdf file

More examples are here: https://www.pdflabs.com/docs/pdftk-cli-examples/

With cpdf, you can reference a page by how far it is from the end of the document, using a tilde, as well as the beginning.

So, we can do

cpdf in.pdf 1-~2 -o out.pdf

You need to find out the page count, then use this with the pdftk cat function, since (AFAICT) pdftk does not allow one to specify an "offset from last".

A tool like 'pdfinfo' from Poppler (http://poppler.freedesktop.org/) can provide this.

Wrapping this in a bit of bash scripting can easily automate this process:

page_count=`pdfinfo "$INFILE" | grep 'Pages:' | awk '{print $2}'`
page_count=$(( $page_count - 1 ))
pdftk A="$INFILE" cat A1-$page_count output "$OUTFILE"

Obviously adding parameters, error checking, and what-not also could be placed in said script:

#! /bin/sh

### Path to the PDF Toolkit executable 'pdftk'
pdftk='/usr/bin/pdftk'
pdfinfo='/usr/bin/pdfinfo'


####################################################################
script=`basename "$0"`


### Script help
if [ "$1" = "" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ] || [ "$1" = "-?" ] || [ "$1" = "/?" ]; then
    echo "$script: <input-file.PDF> [<output-file.PDF>]"
    echo "    Removes the last page from the PDF, overwriting the source"
    echo "    if no output filename is given"
    exit 1
fi

### Check we have pdftk available
if [ ! -x "$pdftk" ] || [ ! -x "$pdfinfo" ]; then
    echo "$script: The PDF Toolkit and/or Poppler doesn't seem to be installed"
    echo "    (was looking for the [$pdftk] and [$pdfinfo] executables)"
    exit 2
fi

### Check our input is OK
INFILE="$1"
if [ ! -r "$INFILE" ]; then
    echo "$script: Failed to read [$INFILE]"
    exit 2
fi

OUTFILE="$2"
if [ "$OUTFILE" = "" ]; then
    echo "$script: Will overwrite [$INFILE] if processing is ok"
fi

timestamp=`date +"%Y%m%d-%H%M%S"`
tmpfile="/tmp/$script.$timestamp"

page_count=`$pdfinfo "$INFILE" | grep 'Pages:' | awk '{print $2}'`
page_count=$(( $page_count - 1 ))

### Do the deed!
$pdftk A="$INFILE" cat A1-$page_count output "$tmpfile"

### Was it good for you?
if [ $? -eq 0 ]; then
    echo "$script: PDF Toolkit says all is good"
    if [ "$OUTFILE" = "" ]; then
        echo "$script: Overwriting [$INFILE]"
        cp -f "$tmpfile" "$INFILE"
    else
        echo "$script: Creating [$OUTFILE]"
        cp -f "$tmpfile" "$OUTFILE"
    fi
fi


### Clean Up
if [ -f "$tmpfile" ]; then
    rm -f "$tmpfile"
fi