$wpdb is a PHP global variable that holds the WordPress database object, which is actually an instantiation of the wpdb class. $wpdb is used to manipulate custom database tables with…
ABSPATH is a PHP constant, which holds the Absolute path to the WordPress directory. It is defined in wp-config.php /** Absolute path to the WordPress directory. */ if ( !…
You can use a hash function, avialable in any operation system, for example sha256sum with a photo or an mp3 file, any file you can easily remember. For example, from…
Delete a Command from Bash History Here I give some test commands to fill history: pontikis@ubuntu:~$ clear pontikis@ubuntu:~$ echo 1 1 pontikis@ubuntu:~$ echo 2 2 pontikis@ubuntu:~$ echo 3 3 pontikis@ubuntu:~$…
In Ubuntu, Grub boot menu is hidden by default. You can display it by pressing "SHIFT" continuously at boot time. This is useful (among other cases) in case you want…
