Linux

cd /var/www
mkdir dirname

Find recursively the amount stored in directory

du -sh /home/staging/

Count Inode Usage In Linux?

find . -printf "%h\n" | cut -d/ -f-2 | sort | uniq -c | sort -rn

xampp

https://www.apachefriends.org/faq_linux.html

Note: in case you're not able to create files, folders or other things in the directory, execute the following command to grant all rights to the htdocs folder of xampp.

sudo chmod 777 -R /opt/lampp/htdocs/

To start XAMPP simply call this command:

sudo /opt/lampp/lampp start

To stop XAMPP simply call this command:

sudo /opt/lampp/lampp stop