It's short and sweet!
du -hs *
If you run this command it will tell you the sizes of all the files and folder in the current directory.
-h flag is for human readable format and the
-s will give you the size for each file or directory.
If you're looking for the system disk info
And the output will look like this
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on /dev/disk1 233Gi 43Gi 189Gi 19% 1243927 4293723352 0% / devfs 182Ki 182Ki 0Bi 100% 629 0 100% /dev map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home