Working with Linux

"df -h": This shows the disk usage in a human-readable format
"| grep /home": This shows only the home directory
'| tr -s " "': This substitutes multiple spaces for just one space
'| cut -f 2 -d " "': This selects the second column using a space as the delimiter
As you can see, the command printed out 173G, the size of the /home partition. This is a common use
case when chaining multiple commands, each command reducing the output until we get the desired
information and nothing else. In our case, this is the used disk space.
To count all the directories in a folder, use the following command:
ls -p | grep / | wc -l