The purpose of this blog

The purpose of this blog is to post fixes for common linux or unix command line problems including the command line on Mac OS X.

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Enable Anydesk on Linux

 By default, Anydesk doesn't work on Ubuntu as it uses a different display server than what is expected by Anydesk (it expects the traditional X11 rather than Wayland). Dump this into a file, say, "fix_anydesk.sh", and then run it with sudo bash fix_anydesk.sh The script: #!/bin/bash # Check if the user has root privileges if [[ $EUID -ne 0 ]]; then    echo "This script must be run as root"     exit 1 fi # Backup the GDM configuration file GDM_CONFIG="/etc/gdm3/custom.conf" if [[ -f "$GDM_CONFIG" ]]; then     cp "$GDM_CONFIG" "$GDM_CONFIG.bak"     echo "Backup of custom.conf created." else     echo "GDM configuration file not found."     exit 1 fi # Disable Wayland by uncommenting and setting the 'WaylandEnable' option to false sed -i 's/#WaylandEnable=false/WaylandEnable=false/' "$GDM_CONFIG" # Inform the user echo "Wayland has been disabled. The system will use X11 inste...
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Boot MacOS under VirtualBox

  Introduction The following steps are needed to boot Mac OS under VirtualBox. I tested it using Mac OS X 10.13. I can't guarantee this works. You'll need a source/original mac to copy the OS install. Probably Apple won't approve of this because they want you to buy their original hardware, but sometimes you need hosted VMs in the cloud or similar, and they don't really offer that. Steps Commands below are typed in a command line like the Terminal. 1. On a Mac, do this to download an installer disk: softwareupdate --fetch-full-installer --full-installer-version  ... OR download from the app store. If the operating system you want to install is out of date, ie if the Mac tells you the installer is damaged, set your Mac date and time to however many years ago that operating system came out, and turn of automatic date and time in the date and time system preferences. That way the signature of the installer disk / bundle will still be valid (it is invalid if it is older tha...
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DMARC, SPF, DKIM for sendmail on linux

To create DMARC, SPF, and DKIM records for your domain, you'll need to configure the DNS TXT entries for each. Here's how to do it: 1. SPF Record The SPF record helps to identify which mail servers are allowed to send email on behalf of your domain. Step-by-Step: Login to your DNS provider's management panel. Add a new DNS TXT record with the following value: v=spf1 a mx ip4:< myserver.net > -all 2. DMARC Record DMARC tells mail servers how to handle emails that fail SPF or DKIM checks. Step-by-Step: Add a DNS TXT record with the following value: v=DMARC1; p=none; rua=mailto:postmaster@myserver.net; ruf=mailto:postmaster@myserver.net; sp=none; aspf=r; This record means that DMARC is set to "none" (no enforcement). You can change p=none to p=quarantine or p=reject once you are confident your setup is working. 3. DKIM If you haven't installed OpenDKIM, do so: sudo apt-get update sudo apt-get install opendkim opendkim-tools Next, generate your DKIM key p...
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