What tail -n does
tail -n 20 log.txt: Show the last 20 lines of a file — handy for logs.
The tail command page covers what it does in general, with an example.
tail-n20log.txt
tail— command — last lines of a file-n— flag — how many lines20— how many lineslog.txt— argument: a file, a folder, or text
What it does when you run it
$ tail -n 20 log.txt
ok start
error: disk full
ok done
error: retry
ok finished
Run it yourself
The same files. Nothing here can break, and nothing leaves your browser.
Where you use it
Explain other commands
Written by Mikhail Kuzmitskii