Adding onto @Marcus Müller's excellent answer:
# show only the last 1000 lines of the systemd journal (`-n 1000` is implied), # jumping straight to the end (`-e`) journalctl -e # same as above journalctl -n 1000 -e # same as above, except show the last 10000 lines instead of 1000 lines journalctl -n 10000 -e
You can prove this is working by counting the lines. Run and output:
$ journalctl -n 10000 -e | wc -l 10020
Limiting to a fixed number of lines and jumping straight to the end is soooo much faster than running journalctl directly, as my log is loooooooooong, and it takes like a full minute to read to the end of it otherwise.
Going further
Here are some more examples, derived from @Stéphane Chazelas's comment below my answer:
# Show all lines (`-n all`) from today (`--since today`), jumping straight # to the end (`-e`) journalctl -e --since today -n all # Show all lines (`-n all`) since the last boot (`--boot`), jumping straight # to the end (`-e`) journalctl -e --boot -n all