Method issueCommand

app/src/main/java/com/sun/mail/pop3/Protocol.java:1192–1201

Send the specified command.

(String cmd)

     * Send the specified command.
     */
    private void issueCommand(String cmd) throws IOException {
	if (socket == null)
	    throw new IOException("Folder is closed");	// XXX

	if (cmd != null) {
	    cmd += CRLF;
	    output.print(cmd);	// do it in one write
	    output.flush();
	}
    }

    /**
     * Read the response to a command.