xampp installed in ubuntu but php and mysql shows not found

I have installed XAMPP version 7.4 in UBUNTU OS,

now when I go to the terminal and type php -v command,

it shows

root@roy:/opt/lampp/htdocs/magento242# php -v

Command 'php' not found, but can be installed with:

apt install php7.4-cli

also when i type mysql -u root -p it shows like below,

root@roy:/opt/lampp/htdocs/magento242# sudo mysql -u root -p
sudo: mysql: command not found
root@roy:/opt/lampp/htdocs/magento242# mysql -u root -p

Command 'mysql' not found, but can be installed with:

apt install mysql-client-core-8.0     # version 8.0.23-0ubuntu0.20.04.1, or
apt install mariadb-client-core-10.3  # version 1:10.3.25-0ubuntu0.20.04.1

I don't understand that what is the problem exactly.

but when I run localhost/phpmyadmin then phpmyadmin is open. so what is the problem with that?

please provide me some suggestions on that, thanks.

You need to start Lampp first then mysql. Follow these steps:

1. Open up terminal using CTRL+ALT+T

2. type

sudo /opt/lampp/lampp start

3.Switch to the XAMPP installation directory. Type in

cd /opt/lampp

4.Then you just need to type this command in order to run lampp properly

sudo ./manager-linux-x64.run

if you need to use mysql in terminal do the next step

5.cd /opt/lampp/bin

./mysql -u root