post_install() {
    echo "## To complete installation, add the following line to your bashrc"
    echo '## [[ -f /usr/share/nwd/nwd-preexec.sh ]] && source /usr/share/nwd/nwd-preexec.sh'
    echo '## and restart bash'
}

post_upgrade() {
    echo '## Upgrade will be effective only you restart bash'
}

post_removal() {
    echo "## To complete removal, remove the source of nwd-preexec.sh from your bashrc"
}