To upgrade a Red Hat Enterprise Linux (RHEL) system from an earlier version (e.g., 5.4) to version 5.5, you can use the yum package manager to update the system to the latest available patches and security updates.
It is important to note that upgrading a system from one major release to another (e.g., from RHEL 5.4 to RHEL 5.5) can be a risky process, and it is important to follow the instructions carefully to avoid causing any damage to your system. It is also a good idea to back up your important data before proceeding with the upgrade.
Here are the steps to upgrade a RHEL 5.4 system to RHEL 5.5 using yum:
Open a terminal window and log in to the system as the root user.
Run the following command to update the package manager's list of available patches and security updates:
yum update
yum upgrade
This will check for any additional patches and security updates that may be required to upgrade the system to RHEL 5.5.
If any additional patches or security updates are required, follow the prompts to install them.
Once all the patches and security updates have been installed, you will need to reboot the system in order for the changes to take effect. To reboot the system, run the following command:
reboot
After the system has rebooted, you can verify that the system has been upgraded to RHEL 5.5 by running the uname -r command, which will display the current Red Hat version.
For more information about upgrading a RHEL system using yum, you can consult the documentation or visit the Red Hat website.