System Administration

MySQL List Users Command – How to Show / List All Users in MySQL / MariaDB

In order to list all the configured DB users in a MySQL or MariaDB, you must be logged in as an administrator: /home/grokman grokman@li598-26% sudo mysql -u root -p Then you can issue the command to list all the DB users: select user, Super_priv from mysql.user; So, it should go something like this: Other user …

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Disable Background Apps in Windows 10

Welcome to the Grok Shop! If you look at your task manager in Windows 10, you might find some apps running that you didn’t start up yourself. For example, here I’m showing the “YourPhone.exe” app which I’ve never used and definitely did not start myself: So what’s going on, right? In Windows 10, Microsoft introduced …

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Linux Kernel – Check Installed and Switch Boot Kernel

See Installed Kernels In Debian & Ubuntu, we can see the installed kernels with: % dpkg –list | grep linux-image ii linux-image-3.16.0-4-amd64 3.16.51-3 amd64 Linux 3.16 for 64-bit PCs ii linux-image-3.16.0-6-amd64 3.16.56-1+deb8u1 amd64 Linux 3.16 for 64-bit PCs ii linux-image-4.9.0-11-amd64 4.9.189-3 amd64 Linux 4.9 for 64-bit PCs ii linux-image-amd64 In Fedora / CentOS / RedHat …

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Debugging and Tracing In Postfix

Turn up logging for individual clients A really nice feature Postfix has is this ability to debug individually-specified hosts and this is how you do that.  Just add this to your main.cf: # Debug individually-specified hosts debug_peer_level=3 debug_peer_list=regexp:/etc/postfix/debug_peers In this case I have set the debug level to 3.  The default level is 2.  Also …

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