To find the Dell service tag on a Red Hat or CentOS Linux system, you can use the dmidecode command.
The dmidecode command is a utility that can be used to retrieve hardware information from the system's BIOS. To find the Dell service tag, you can run the following command:
sudo dmidecode -s system-serial-number
This will output the Dell service tag for the system.
Keep in mind that you will need to have root privileges (or be a member of the sudo group) in order to run the dmidecode command.
You can also use the dmidecode command to retrieve other hardware information, such as the system's model number and BIOS version. For example, to view the system's model number, you can use the following command:
sudo dmidecode -s system-product-name
To view the BIOS version, you can use the following command:
sudo dmidecode -s bios-version