#!/bin/sh
#
if [ $# -eq 0 ]; then
    echo "usage: ilbmtog4 file" >&2
    exit 1
fi
f=$1
case "$1" in
*.[Ii][Ff][Ff])
    f="${1%.[Ii][Ff][Ff]}";;
*.[Ii][Ll][Bb][Mm])
    f="${1%.[Ii][Ll][Bb][Mm]}";;
*.[Hh][Aa][Mm])
    f="${1%.[Hh][Aa][Mm]}";;
esac
ilbmtoppm "$1" | ppmtopgm | pgmtopbm | pnmtotiff -g4 > "$f.tif"
.