The du (disk usage) utility in Linux bash summarizes the disk usage of each directory or file. By default, it outputs only directories. Just enter some directory and type
1$ du ./
But if ./ has many subdirectories, the output will be too long. And it is unsorted. The task stated in the title can be achieved by piping.
Cut the first line: it is the size of the ./ directory as a sum of the other sizes.
Use --human-readable in du, or divide by 1024 to get KBytes, MBytes, etc. I divide by 1000 to get results close to the Nautilus ones.
The resulting command:
1$ du -b --max-depth=1 | sort -nr | sed -n '2,4p' | awk '{print $1/1000^3" Gb\t" $2}'