Linux / Unix vi / vim: Open and Switch Between Multiple Files

in Categories , , , , , , , last updated October 18, 2015

I am new to Linux sysadmin work. I am using vi / vim text editor to edit files located in /etc/ directory. I open files using

vi /etc/resolv.conf /etc/hosts

I can edit the /etc/resolv.conf file only. How do I switch between the two open files while using vim text editor under Linux / BSD / Apple OS X / Unix like operating systems?

RHN yum command: Unable to read consumer identity Warning and Solution

in Categories , last updated November 17, 2012

I am using yum update command with RHN to upgrade packages installed on my server, but getting the following warning on screen :

yum update -y
Loaded plugins: product-id, protectbase, rhnplugin, security, subscription manager:
Updating certificate-based repositories.
Unable to read consumer identity
0 packages excluded due to repository protections
Setting up Update Process
Resolving Dependencies
--> Running transaction check

How do I get rid of this warning /error under RHEL 6 server?