Often times, there is a need to check the size of directories or files in a project, or to evaluate the space a directory occupies in a live/development server, or just at our local machine.

Here is a list of useful commands that you can leverage to make sure the available disk space of your machine is normal and that the huge node_modules directory size of your project hasn't gone crazy :D

We will use the du command, which is explained below:

du (disc usage) command estimates file_path space usage

The options -sh are (from man du):

  -s, --summarize
         display only a total for each argument

  -h, --human-readable
         print sizes in human readable format (e.g., 1K 234M 2G)

To check more than one directory and see the total, use du -sch:

  -c, --total
         produce a grand total

So, let's see the basic commands:

Shows you the size of the directory in readable format:

$ du -sh directory/

Shows you a list with all the directories along with their sizes, ordered by size:

$ du -sh * | sort -h

Example in my example flutter project:

paul@paul-Inspiron-N5110:~/projects/flutter_test$ du -sh * | sort -h
4,0K    android.iml
4,0K    flutter_test_android.iml
4,0K    flutter_test.iml
4,0K    pubspec.yaml
4,0K    README.md
8,0K    test
12K lib
200K    android
212K    ios

Also, if you want to include hidden files and directories, you can run:

$ du -sch .[^.]* * |sort -h

Bonus:

Outputs the total and available size of your system's paritions

$ df -h

Outputs the inodes usage in your system:

$ df -i

If you have more useful commands to share, leave them in the comments below!