Linux useful commands

Unzip sql.gz database 

gzip -d db.sql.gz

Compress tar.gz a whole folder 

tar -czvf site.tar.gz /var/www/site.url/htdocs

Zip WordPress folder 

zip -r site.zip /var/www/site.url/htdsocs

Unzip tar.gz 

tar -xzf site.tar.gz

Check site size in disk 

du -cksh /var/www/*

Check your website database sizes

You can check individual database sizes with the following: 

cd /var/lib/mysql

du -h --max-depth=1 | sort -h

Import database in WordPress with wp-cli

wp db import wordpress_dbase.sql

Export database of WordPress site with wp-cli

wp db export db.sql