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What head -n does

Show the first 5 lines of a file.

head-n5log.txt

head— command — first lines of a file
-n— flag — how many lines
5— argument: a file, a folder, or text
log.txt— argument: a file, a folder, or text

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What it does when you run it

$ head -n 5 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.

Explain other commands

ls -la rm -rf mkdir -p grep -rni cat … | grep find -name chmod +x echo > file

Written by Mikhail Kuzmitskii