To get the installation number for Red Hat Enterprise Linux (RHEL), you can use the subscription-manager command-line utility. This utility is included with RHEL and allows you to manage your subscriptions and product registrations.
To get the installation number for your system, you can use the subscription-manager identity command. This command will display the installation number and other registration information for your system.
For example, to get the installation number, you can use the following command:
subscription-manager identity | grep "Installation Number"
This will output a line similar to the following:
Installation Number: abcdef123456
The installation number is a unique identifier for your system and is used to identify your system when you register it with Red Hat or when you request support.
It's important to note that the subscription-manager utility requires a valid Red Hat account and an active subscription to use. If you do not have a Red Hat account or your subscription has expired, you will not be able to use this utility to get the installation number.