Size of Directories and Files

For the size of a file:

ls -lh somefile.txt | awk '{ print $5}'

For the size of a directory:

du -sh /somedirectory

For the size of your home directory:

du -sh /pathtoyourdirectory

Because the last command might delay to extract the output, in their home directory there is a file, named quota.txt, by which users can be aware of their storage size (along with their quota limits)