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/usr/bin/xfig-pdf-viewer is in xfig-doc 1:3.2.5.c-1ubuntu1.

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
#
# $Id: xfig-pdf-viewer,v 1.4 2006/07/22 16:14:39 roland Exp $
#
##########################################################################
#
# xfig-pdf-viewer is a little shell script, which tries to find out
# which PDF viewer you have installed on your system and then starts
# them. The environment variable PDFVIEWER has priority over all other
# viewers.
# See xfig-pdf-viewer(1) man page for more information.
#
##########################################################################
#
#   Copyright (C) 1999-2006  Roland Rosenfeld <roland@spinnaker.de>
#
#   This program is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License as
#   published by the Free Software Foundation; either version 2 of
#   the License, or (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#   General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
#
##########################################################################

if [ "$1" = "-n" ]; then
    echo "No viewer found in xfig-pdf-viewer(1), please set PDFVIEWER"
    echo "environment variable or install a PDF viewer"
    read dummy
    exit 0
fi

if [ $# -ne 1 ]; then
    echo "Usage: $0 file.pdf"
    exit 0
fi

if [ "$PDFVIEWER" != "" ]; then
    :
elif type xpdf >/dev/null 2>&1; then
    PDFVIEWER=xpdf
elif type kpdf >/dev/null 2>&1; then
    PDFVIEWER=kpdf
elif type evince >/dev/null 2>&1; then
    PDFVIEWER=evince
elif type acroread >/dev/null 2>&1; then
    PDFVIEWER=acroread
elif type gpdf >/dev/null 2>&1; then
    PDFVIEWER=gpdf
elif type gv >/dev/null 2>&1; then
    PDFVIEWER=gv
elif type gnome-gv >/dev/null 2>&1; then
    PDFVIEWER=gnome-gv
elif type kghostview >/dev/null 2>&1; then
    PDFVIEWER=kghostview
elif type ghostview >/dev/null 2>&1; then
    PDFVIEWER=ghostview
else
    exec x-terminal-emulator -e $0 -n
fi

exec $PDFVIEWER "$1"