Magento Set the File permission

Magento Set the File permission (you need to be root/ sudo)

sudo find var generated vendor pub/static pub/media app/etc -type f -exec chmod g+w {} \; && sudo find var vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} \; && sudo chown -R www-data:www-data . && sudo chmod u+x bin/magento

With the path:
cd /var/www/html/magento2 && find var generated vendor pub/static pub/media app/etc -type f -exec chmod u+w {} + && find var generated vendor pub/static pub/media app/etc -type d -exec chmod u+w {} + && chmod u+x bin/magento
UPDATE  `MySQL_Table` SET  `MySQL_Table_Column` = REPLACE(`MySQL_Table_Column`, 'oldString', 'newString') WHERE  `MySQL_Table_Column` LIKE 'oldString%';

When Should I use MySQL Search and Replace?

Doing a Search and Replace via SQL could be dangerous if you have links that you’re unaware of which shouldn’t be changed. You should Search and Replace only when you’re convinced that you have to change the text in your Database. You should always perform a Database backup before proceeding with any manual changes.

Linux and Unix Copy files

To copy a directory with all subdirectories and files, use the cp command. Below is an example command of how you would use the cp command to copy files. Additional information about this command and other examples are available through the above cp link.

cp -r /home/hope/files/* /home/hope/backup

In the example above, the cp command would copy all files, directories, and subdirectories in the /home/hope/files directory to the /home/hope/backup directory.

or

Copy a folder called /tmp/conf to /tmp/backup:

cp -avr /tmp/conf/ /tmp/backup

-a : Preserve the specified attributes such as directory an file mode, ownership, timestamps, if possible additional attributes: context, links, xattr, all.

-v : Explain what is being done.

-r : Copy directories recursively. Example