**JUST A QUICK SOLUTION FOR LINUX USERS**
Move the original "mysql" client (/usr/bin/mysql) to a backup copy.
`mv /usr/bin/mysql /usr/bin/mysql.origina`l
Then create a symbolic link to the "XAMPP" client (/opt/lampp/bin/mysql) in the original location like this:
ln -s /opt/lampp/bin/mysql /usr/bin/mysql
Now just typing `mysql` on the terminal will launch XAMPP's own mysql.
Check out this link for details https://www.howtoforge.com/allow-your-applications-to-access-the-xampp-mysql-server-directly

**FOR LINUX USERS**
Move the original "mysql" client (/usr/bin/mysql) to a backup copy.
`mv /usr/bin/mysql /usr/bin/mysql.origina`l
Then create a symbolic link to the "XAMPP" client (/opt/lampp/bin/mysql) in the original location like this:
ln -s /opt/lampp/bin/mysql /usr/bin/mysql
Now just typing `mysql` on the terminal will launch XAMPP's own mysql. Check out this link for details https://www.howtoforge.com/allow-your-applications-to-access-the-xampp-mysql-server-directly