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How to grep the output of tail

When following a log file with the tail command you are typically looking for a specific pattern. If the log output is verbous it can be difficult to catch the lines your interested in. For example a PHP log file might contain many PHP Notice: entries but your only interested in lines containing PHP Fatal error:. To grep the output of tail simply tell the grep command to red from stdin and pipe the output from tail to grep as follows.

tail -f {path/to/log/file} | grep 'PHP Fatal error:' -

How to set up PulseAudio over Network

PulseAudio actually has great networking capabilities. Especially when combined with Avahi/Zeroconf it is especially easy to set up, though technically it should also be possible without.

Setting up the server

Open /etc/pulseaudio/default.pa
At the end of the file, add load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1;192.168.254.0/24 auth-anonymous=1 to activate networked audio from 192.168.254.0-255 without needing authentication.
Kill pulseaudio, it should be auto-restarted, or restart your login session to activate the changes. You should now be able to set PULSE_SERVER=192.168.254.XXX and have the remote audio working! If not check the firewall settings, PulseAudio seems to open a random port by default.

Setting up automatic configuration and discovery

On both the server and client, install pulseaudio-module-zeroconf and avahi, then after installing make sure Avahi always runs by running systemctl enable --now avahi-daemon

scph5500.bin 26-Aug-2018 20:47 512.0K

scph5501.bin 26-Aug-2018 20:47 512.0K

scph5502.bin 26-Aug-2018 20:47 512.0K

Configuring Cyclone DDS for Wifi + Ethernet connection on an Enterprise Network (for ROS2)

For communication between wifi and ethernet devices, the DDS layer in ROS2 relies on the multicast ability of a given network.

This is often disabled on enterprise networks (at university or work etc) for (I think) security reasons .

To get around this, you have to configure CycloneDDS to comunicate in a unicast manner, and you must specify the local IPs of all the participants you want to communicate.

_I am using CycloneDDS instead of the default (for ROS2 humble at least) FastDDS, because I ran into lots of issues trying to get topic

RetroNAS on Unraid

This guide is intended for installing RetroNAS on an already configured Unraid server. If you're not familiar with Unraid or RetroNAS, head over to the RetroNAS GitHub page to learn about RetroNAS and consider setting it up on a Raspberry Pi.

Unraid NFS Setup

Within Unraid, enable NFS by going to Settings and NFS.

Enable NFS: Yes
Click Apply

Setup a new TypeScript project with Mocha support

Ensure you have TypeScript installed globally using this command:

npm install -g typescript

This outlines how to setup a new TypeScript project with mocha support.

	package main
	import "fmt"
	func main() {
	fmt.Println("hello world")
	}

	/*
	##Cihaz = Masaüstü
	##Ekran = 1281px 'den yüksek çözünürlükler için
	*/

	@media (min-width: 1281px) {

	//CSS

	}

	py.test test_sample.py --collect-only # collects information test suite

	py.test test_sample.py -v # outputs verbose messages

	py.test -q test_sample.py # omit filename output

	python -m pytest -q test_sample.py # calling pytest through python

	py.test --markers # show available markers