post_install(){
    if [ -d /usr/share/ppd ] ; then
      cd /usr/share/cups/model
      for fn in CN*ZK.ppd ; do \
        ln -sf "/usr/share/cups/model/"$fn /usr/share/ppd/$fn ;
      done
    fi
    chmod 4755 /usr/bin/cnpkmoduleufr2
    cat << EOF
    >>> Installation:
    >>> 1) Make sure CUPS is running and your printer is turned on and connected to your computer.
    >>> eg.
    >>> systemctl start cups
    >>>
    >>> 2) Check the name of the device, udev created for you.
    >>> eg. /dev/usb/lp0
    >>>
    >>> 3) /usr/sbin/lpadmin -p [Printer Name] -m [PPD file] -v usb:[device file location] -E
    >>> eg.
    >>> /usr/sbin/lpadmin -p LBP2900 -m CNCUPSLBP2900CAPTK.ppd -v usb:/dev/usblp0 -E 
    >>> you can find ppds in the /usr/share/cups/model/ directory)
    >>>
    >>> 4) Now you can print. Consider using "systemctl enable cups" to have it start automatically on boot
    
EOF
}

post_upgrade(){
	post_remove
	post_install
}

post_remove(){
  if [ -d /usr/share/ppd ] ; then
    rm -rf /usr/share/ppd/CN*ZK.ppd
  fi
}

op=$1
shift
$op $*