I definitely agree with most of the others on this one .. CLI is important. The GUI isn't always reliable and, inevitably, there is something that the vendor has left out of the GUI (either overlooked it or did it on purpose) that requires access via the CLI. Also, there are some cases where the CLI is just a faster way to accomplish what you need to do. Don't get me wrong, I am thankful for GUI interfaces, but I don't think anything will ever beat the good, old fashioned, CLI.
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