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Read more about the article What is $wpdb in WordPress and How to Use it for Database Security
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What is $wpdb in WordPress and How to Use it for Database Security

  • Post author:Christos Pontikis
  • Post published:December 1, 2022
  • Post category:WordPress
  • Reading time:3 mins read

$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…

Continue ReadingWhat is $wpdb in WordPress and How to Use it for Database Security
Read more about the article What is ABSPATH in WordPress and How to Use it for Security
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What is ABSPATH in WordPress and How to Use it for Security

  • Post author:Christos Pontikis
  • Post published:December 1, 2022
  • Post category:WordPress
  • Reading time:1 mins read

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 ( !…

Continue ReadingWhat is ABSPATH in WordPress and How to Use it for Security
Read more about the article How To Create A Strong Password Without Having To Remember It
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How To Create A Strong Password Without Having To Remember It

  • Post author:Christos Pontikis
  • Post published:December 22, 2016
  • Post category:Network Security
  • Reading time:2 mins read

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…

Continue ReadingHow To Create A Strong Password Without Having To Remember It
Read more about the article How To Delete or Not Keep a Command in Bash History
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How To Delete or Not Keep a Command in Bash History

  • Post author:Christos Pontikis
  • Post published:December 21, 2016
  • Post category:Linux Administration
  • Reading time:2 mins read

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:~$…

Continue ReadingHow To Delete or Not Keep a Command in Bash History
Read more about the article How to Display Grub Menu at Boot Time in Ubuntu
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How to Display Grub Menu at Boot Time in Ubuntu

  • Post author:Christos Pontikis
  • Post published:October 25, 2016
  • Post category:Linux Administration
  • Reading time:2 mins read

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…

Continue ReadingHow to Display Grub Menu at Boot Time in Ubuntu
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