Why doesn’t ‘wp’ command work in my WP-CLI installation?

Sounds like you need to rename the wp-cli.phar to wp.

chmod +x wp-cli.phar
sudo mv wp-cli.phar /usr/local/bin/wp

I usually move wp to my home folder’s bin directory so /home/YOUR_USER_NAME/bin

now try:

wp --info

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)