du

The du (i.e., disk usage) command reports the sizes of directory trees inclusive of all of their contents and the sizes of individual files.

One of the most useful options is -h (i.e., human readable), which can make the output easier to read by displaying it in kilobytes (K), megabytes (M) and gigabytes (G) rather than just in the default kilobytes

du -h --max-depth=1

Get the total size of current directory. -s (summarize) and -h (human readable format)

du -sh

get the size of file and directory in current directory.

du -sh *

get the size of file

du -sh filename