How to check the current disk space used by my linux?

"At a command line, type

df -a

This will list each device and usage information.

You might find

df -h

more readable, since it gives quantities in Gb or Mb, etc."

"du . -h --max-depth=1

lists the size of all the folders in the current directory (or at a location of your choice)"

df -h
df -h

"There is also ncdu:

Not quite happy with the available disk usage analyzers and looking
for a fun project to get used to C programming, I started working on
ncdu: A disk usage analyzer with an ncurses interface, aimed to be run
on a remote server where you don't have an entire gaphical setup, but
have to do with a simple SSH connection. ncdu aims to be fast, simple
and easy to use, and should be able to run in any minimal POSIX-like
environment with ncurses installed."

du

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