How to tail (follow) Linux Service Logs

One of the most common tasks during Linux troubleshooting and software development sessions is following service logs on a Linux system.

0:00 Introduction
0:17 Example Service (“unit”): nginx
0:29 journalctl -fu nginx
0:33 -u (unit)
0:53 -f (follow)
1:24 Live Tail Example
1:43 pre-systemd equivalent (tail)
2:10 binary journald logs
2:45 Additional documentation

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