Determine the total size of a directory (folder) from the command line Linux

The command du "summarizes disk usage of each FILE, recursively for directories," e.g.,

du -hs /path/to/directory

-h is to get the numbers "human readable", e.g. get 140M instead of 143260 (size in KBytes)
-s is for summary (otherwise you'll get not only the size of the folder but also for everything
in the folder separately)

From man tree:

-h Print the size of each file but in a more human readable way, e.g. appending a size
letter for kilobytes (K), megabytes (M), gigabytes (G), terabytes (T), petabytes (P) and
exabytes (E).

--du For each directory report its size as the accumulation of sizes of all its files and
sub-directories (and their files, and so on). The total amount of used space is also given
in the final report (like the 'du -c' command.)

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