post_install() {
/bin/echo ">> This line has to go the end of [global] section of the smb.conf" 
/bin/echo ">> include = /etc/samba/usershare.conf"  
/bin/echo ">> add yourself to samba group"
}

post_upgrade() {
/bin/true
}

pre_remove() {
/bin/true
}

op=$1
shift

$op $*