This file is indexed.

/usr/lib/printfilters/ppaprint is in printfilters-ppd 2.13-11.1.

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
# ppaprint v2.12  July 7,  2000
#
# make pnm2ppa (or pbm2ppa) command line for postprocessing to produce PPA 
# output for HP's PPA printers (DeskJet 710, 720, 820, 1000 series).
#
# Duncan Haldane, the pnm2ppa project, <duncan_haldane@users.sourceforge.net>
# see also http://sourceforge.net/projects/pnm2ppa
#
BINDIR=/usr/bin
CONFIG_DIR=/etc

PPA_CONFIG=$1
PAPERSIZE=$2
RESOLUTION=$3
EXTRA_GS_OPTIONS=$@
for arg in $1 $2 $3 ; do
    EXTRA_GS_OPTIONS=$(echo "${EXTRA_GS_OPTIONS}" | eval "sed -e 's/^.*$arg//'")
done

if ! [ "$RESOLUTION" = "600x600" ] ; then
    echo "Error - ppaprint: unsupported RESOLUTION=$RESOLUTION" 1>&2
    exit 1
fi

# extract any extra PPA options from $EXTRA_GS_OPTIONS:
# format is $EXTRA_GS_OPTIONS= "(gs_options)PPA(ppa_options)"
EXTRA_PPA_OPTIONS=""
if echo $EXTRA_GS_OPTIONS | grep -e "PPA" >/dev/null 2>&1 ; then
    EXTRA_PPA_OPTIONS=$EXTRA_GS_OPTIONS
    EXTRA_GS_OPTIONS=$(echo "${EXTRA_GS_OPTIONS}" | sed -e 's/PPA.*$//' )
    EXTRA_PPA_OPTIONS=$(echo "${EXTRA_PPA_OPTIONS}" | sed -e 's/^.*PPA//')
fi


# identify paper size
    if [ "$PAPERSIZE" = "letter" ]; then
	PPA_PAPERSIZE="-s letter"
    elif [ "$PAPERSIZE" = "a4" ]; then
	PPA_PAPERSIZE="-s a4"
    elif [ "$PAPERSIZE" = "legal" ]; then
	PPA_PAPERSIZE="-s legal"
    else 
	PPA_PAPERSIZE="-s letter"
    fi

# identify printer type
# (at present, a type 710 is treated as a type 720 in printerdb)
    if echo $PPA_CONFIG | grep -e "ppa710"  > /dev/null 2>&1 ; then
	PPA_PRINTER="-v 710"  
    elif echo $PPA_CONFIG | grep -e "ppa720"  > /dev/null 2>&1 ; then
	PPA_PRINTER="-v 720"  
    elif echo $PPA_CONFIG | grep -e "ppa820"  > /dev/null 2>&1 ; then
	PPA_PRINTER="-v 820"  
    elif echo $PPA_CONFIG | grep -e "ppa1000"  > /dev/null 2>&1 ; then
	PPA_PRINTER="-v 1000"  
    fi

PPA_OPTIONS="$PPA_PAPERSIZE $EXTRA_PPA_OPTIONS"

if echo $PPA_CONFIG | grep -e "pbm"  >/dev/null 2>&1 ; then
# use the old pbm2ppa Black-and-White-only driver
# first check that old pbm2ppa driver is installed
    if ! $BINDIR/pbm2ppa -h > /dev/null 2>&1 ; then
	echo "Error - ppaprint: pbm2ppa driver was not found" 1>&2
	exit 1
    fi

# assemble the pbm2ppa command line: 
    GSDEVICE=pbmraw
    PPA_CONF="$CONFIG_DIR/pbm2ppa.conf"
    if [ -f $PPA_CONF ] ; then
	PPA_CONF="-f $PPA_CONF"
    else
	PPA_CONF=""
    fi
    PPA_OPTIONS="$PPA_PRINTER $PPA_CONF $PPA_OPTIONS"
    PPA="$BINDIR/pbm2ppa  $PPA_OPTIONS - - "

else
# use the new pnm2ppa driver with color support
# first check that new pnm2ppa driver is installed
    if ! $BINDIR/pnm2ppa -h > /dev/null 2>&1 ; then
	echo "Error - ppaprint: pnm2ppa driver was not found" 1>&2
	exit 1
    fi

# papersize is no longer needed by pnm2ppa >= 0.99 
# (the papersize is now taken from the pnm input file header).
    PPA_PAPERSIZE=""

# all pnm formats are now supported by pnm2ppa >= 0.99
# -- use ppmraw for color-enabled printing 
# -- use pbmraw in --bw black and white modes.



# identify color option	
    if   echo $PPA_CONFIG | grep -e "ppa.*0b1"  > /dev/null 2>&1 ; then
	GSDEVICE=pbmraw
	PPA_COLOR="--bw --eco"
    elif echo $PPA_CONFIG | grep -e "ppa.*0b2"  > /dev/null 2>&1 ; then
	GSDEVICE=pbmraw
	PPA_COLOR="--bw"
    elif echo $PPA_CONFIG | grep -e "ppa.*0c1"  > /dev/null 2>&1 ; then
	GSDEVICE=ppmraw
	PPA_COLOR="--eco --fd"
    elif echo $PPA_CONFIG | grep -e "ppa.*0c2"  > /dev/null 2>&1 ; then
	GSDEVICE=ppmraw
	PPA_COLOR="-p --eco"
    elif echo $PPA_CONFIG | grep -e "ppa.*0c3"  > /dev/null 2>&1 ; then
	GSDEVICE=ppmraw
	PPA_COLOR=""
    elif echo $PPA_CONFIG | grep -e "ppa.*0c4"  > /dev/null 2>&1 ; then
	GSDEVICE=ppmraw
	PPA_COLOR="-p --uni"
    elif echo $PPA_CONFIG | grep -e "ppa.*0c5"  > /dev/null 2>&1 ; then
	GSDEVICE=ppmraw
	PPA_COLOR="--eco"

    fi

# assemble the pnm2ppa command line: 

    PPA_CONF="$CONFIG_DIR/pnm2ppa.conf"
    if [ -f $PPA_CONF ] ; then
	PPA_CONF="-f $PPA_CONF"
    else
	PPA_CONF=""
    fi
    PPA_OPTIONS="$PPA_PRINTER $PPA_CONF $PPA_COLOR $PPA_OPTIONS"
    PPA="$BINDIR/pnm2ppa $PPA_OPTIONS -i - -o - "
fi

echo "-sDEVICE=$GSDEVICE $EXTRA_GS_OPTIONS - | $PPA "

exit 0