post_install(){
    cat << EOF
    >>> Installation:
    >>>
    >>> 1) Before doing anything, be sure to add your user to the lp group:
    >>> eg.
    >>>     gpasswd -a your_user lp
    >>> and then reboot, or relogin
    >>>
    >>> 2) Connect the printer to your computer, turn it on and start CUPS, or restart it if it was already running
    >>> eg.
    >>>     systemctl restart cups.service
    >>>
    >>> Ensure that the printer device is connected and switched on.
    >>>
    >>> With captdriver and the CUPS command-line programs already
    >>> installed, run the following command
    >>> to identify the printer's URI:
    >>>     lpinfo -v
    >>> Example output of "lpinfo -v" :
    >>>    file cups-brf:/
    >>>    network beh
    >>>    network lpd
    >>>    network https
    >>>    network ipps
    >>>    file cups-pdf:/
    >>>    network ipp
    >>>    network http
    >>>    network socket
    >>>    direct usb://Canon/LBP2900?serial=0000C3J0LGaQ
    >>>    network smb
    >>>
    >>> 3) Run this command to add the printer to CUPS:
    >>>     /usr/bin/lpadmin -p <name> -m <corresponding ppd> -v <device path in lpinfo -v> -E
    >>> eg.
    >>>     /usr/bin/lpadmin -p 'LBP2900' -m CanonLBP-2900-3000.ppd -v 'usb://Canon/LBP2900?serial=0000C3J0LGaQ' -E
    >>> (you can find ppds in the /usr/share/cups/model/ directory)
    >>> 4) Optionally, you can set the newly-installed printer as default with this command:
    >>>     lpadmin -d 'LBP3000'
    >>>
    >>> For more details check out the project wiki: https://github.com/mounaiban/captdriver/wiki
    >>> and the project official install guide:
    >>> https://github.com/mounaiban/captdriver/wiki/Building-and-Installing-captdriver%3A-A-Unified-Guide
    >>>
EOF
}

op=$1
shift
$op $*