This file is indexed.

/usr/bin/pdfpun is in pdfjam 2.05-2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
##
##  pdfpun: A shell program to n-up pages of a PDF file with
##          the n-upped pages ordered from right to left
##
##  Author David Firth (http://go.warwick.ac.uk/dfirth)
##
##  This is a simple wrapper for (three runs of) pdfjam, version 2.05
##
##
E_USAGE=64           ##  for a command line usage error
##
for arg
do
    case $arg in
	--batch)
	    printf "pdfpun ERROR: the --batch option is not allowed\n" 1>&2; 
	    exit "$E_USAGE" ;;
        --no-tidy) 
	    n='--no-tidy' ;;
	--quiet | -q)
	    q='-q' ;;
	--checkfiles)
	    c='--checkfiles' ;;
	*) continue ;;
    esac
done
sourceFile="$1" ;
shift ;
##
##  Some (very) minimal checking of the first argument:
##
if test ! -f "$sourceFile" ;
then
    printf "pdfpun ERROR: first argument must be a PDF file\n" ; 
    exit $E_USAGE ;
fi
if test "$sourceFile" = /dev/stdin ;
then
    if tty -s ; then
	printf "pdfpun ERROR: tty is connected to connected to stdin, no PDF file found\n" 
	exit $E_USAGE ;
    fi
fi
##
##  That's all the argument checking!
##
pageSpec="-"         ## the default
case ${1} in
    --* | "") 
	;;
    *)     ## a page spec was given
	pageSpec="$1" ;
	shift ;;
esac
case ${1} in 
    --outfile)
	outFile="$2" ;
        shift; shift ;;
    *) 
	;;
esac
if test -z "$outFile" ; 
then 
    printf "pdfpun ERROR: no output file specified\n" 1>&2 ; 
    exit "$E_USAGE" ;  
fi 
pdfjam --reflect true $n $q $c "$sourceFile" "$pageSpec" -o /dev/stdout | \
  pdfjam --landscape --nup 2x1 "$@" -o /dev/stdout | \
    pdfjam --suffix nup --reflect true --fitpaper true $n $q -o "$outFile"