az-vm:tldr:dc81d

This is a command for the Azure CLI (Command-Line Interface) tool that starts a virtual machine in Azure. Here is the breakdown of the command:

• az: It is the command to execute Azure CLI commands.
• vm: It specifies that the command operates on a virtual machine.
• start: It is the action to start the virtual machine.
• --resource-group ${rg}: It specifies the resource group of the virtual machine. ${rg} is a placeholder that represents the actual name of the resource group. You need to replace ${rg} with the name of the resource group where the virtual machine is located.
• --name ${vm_name}: It specifies the name of the virtual machine to start. ${vm_name} is a placeholder that represents the actual name of the virtual machine. You need to replace ${vm_name} with the name of the virtual machine you want to start.

By running this command with the appropriate values for ${rg} and ${vm_name}, the specified virtual machine in the given resource group will be started.