post_install(){
    cat << EOF
    This is the premium core of clash which is close-sourced.
    You can find the manual at https://github.com/Dreamacro/clash/wiki/Premium-Core-Features
EOF
    post_upgrade
}

post_upgrade(){
    echo setcap "cap_net_admin=ep" for usr/bin/clash
    setcap "cap_net_admin=ep" usr/bin/clash
}