'yarn' is not recognized as an internal or external command, operable program or batch file. code example

Example 1: bash: yarn: command not found

brew install yarn

Example 2: yarn install No such file or directory: 'install'

sudo apt remove cmdtest
sudo apt remove yarn
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt-get update
sudo apt-get install yarn -y
yarn install