preinst is in pspp 0.7.9+git20120620-1.2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | #!/bin/sh
set -e
# Remove a no-longer used conffile
# Using old school style since dpkg (>= 1.15.7.2) is too new for backports
rm_conffile() {
    local PKGNAME="$1"
    local CONFFILE="$2"
    [ -e "$CONFFILE" ] || return 0
    local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
    local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PKGNAME | \
            sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
    if [ "$md5sum" != "$old_md5sum" ]; then
        echo "Obsolete conffile $CONFFILE has been modified by you."
        echo "Saving as $CONFFILE.dpkg-bak ..."
        mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
    else
        echo "Removing obsolete conffile $CONFFILE ..."
        rm -f "$CONFFILE"
    fi
}
case "$1" in
install|upgrade)
    # Migration from 0.6.X-Y to 0.7.8 or higher
    # The last version needs to get bumped when there is another 0.6.X-Y package
    if dpkg --compare-versions "$2" le "0.6.2-4"; then
	rm_conffile pspp "/etc/pspp/devices"
        rm_conffile pspp "/etc/pspp/psfonts/Courier.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Courier-Bold.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Courier-BoldOblique.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Courier-Oblique.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Helvetica.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Helvetica-Bold.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Helvetica-BoldOblique.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Helvetica-Oblique.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Times-Bold.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Times-BoldItalic.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Times-Italic.afm"
        rm_conffile pspp "/etc/pspp/psfonts/Times-Roman.afm"
    fi
esac
exit 0
 |