Vertica User Management

Create testuser with read-only access to testtable in testschema.

CREATE USER testuser IDENTIFIED BY 'password123';
GRANT USAGE ON SCHEMA testschema TO testuser;
GRANT SELECT ON testschema.testtable TO testuser;

NetworkManager: Disable Sending Hostname to DHCP Server

Edit /etc/NetworkManager/NetworkManager.conf file to contain the following default settings for new connections:

[connection]
ipv4.dhcp-send-hostname=false
ipv6.dhcp-send-hostname=false

Disable sending hostname to DHCP server for already existing connections:

nmcli -t -f uuid connection | while read uuid; do
 nmcli connection modify $uuid \
 ipv4.dhcp-send-hostname false \
 ipv6.dhcp-send-hostname false
done

Restart NetworkManager to apply the settings:

systemctl restart NetworkManager

Perl UDP Daemon

A simple UDP daemon listening on UDP/162 port.

	perl -MPOSIX -MIO::Socket -We '
	my $s = IO::Socket::INET->new(
	Proto => "udp",
	LocalAddr => "0.0.0.0:162"
	);
	while ( $s->recv( $_, 65535 ) ) {
	print strftime( "%F %T", localtime ), " ", $s->peerhost(), " $_\n";
	}'

view raw perl-udp-daemon.pl hosted with ❤ by GitHub

MPV Restore Playback

Configure MPV to remember playback position when closing its window so that the playback can be resumed automatically when the video is watched the next time:

echo 'CLOSE_WIN quit_watch_later' >> ~/.config/mpv/input.conf