boot logs and more with journalctl

On machines with systemd, we see systemd logs with journalctl - How to Read and Edit Systemd Logs using Journalctl in linux

https://www.geeksforgeeks.org/how-to-read-and-edit-systemd-logs-using-journalctl-in-linux/

journalctl -b -1 for previous boot logs.

These still work - 

tail /var/log/syslog
tail /var/log/dmesg 

Other logs still seen in /var/log are auth.log and boot.log

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On newer systems, there is no /var/log/syslog - 

https://linuxblog.io/how-to-diagnose-oom-errors-on-linux-systems/

- /var/log/syslog does not exist.

https://unix.stackexchange.com/questions/607221/tail-f-log-but-with-systemd

https://linuxhandbook.com/journalctl-command/

journalctl -r for reverse chronological order.

spacebar to move forward, b to move backward.