All other commands don't involve unstructured data. In all of them, the client sends one command line, and expects (depending on the command) either one line of response, or several lines of response ending with "END" on the last line.

A command line always starts with the name of the command, followed by parameters (if any) delimited by whitespace. Command names are lower-case and are case-sensitive.

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J. Jeyaseelan
Everything Possible