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For example, it is conventional that when you Telnet to a Unix machine, you are presented with aa login: prompt at which you type your username, and a password: prompt where you enter your password The small embedded devices that still use Telnet these days might follow a slightly simpler script, but they, too, often ask for some sort of password or authentication But the point is that Telnet knows nothing about this! To your Telnet client, password: is just nine random characters that come flying across the TCP connection and that it must print to your screen It has no idea that you are being prompted, that you are responding, or that in a moment the remote system will know who you are.

A labeled statement consists of an identifier, followed by a colon, followed by a statement. It has the following form: Identifier: Statement A labeled statement is executed exactly as if the label were not there and consisted of just the Statement part. Adding a label to a statement allows control to be transferred to the statement from another part of the code. Labeled statements are only allowed inside blocks.

In this chapter, you created your first Popfly mashup. The mashup retrieved an RSS feed from a blog and displayed it in a News Reader using blocks that you configured and connected in Popfly s block design surface. You also added HTML to your mashup page. You shared it with the Popfly community so that members can see, rate, and mix your mashup.

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The fact that Telnet is ignorant about authentication has an important consequence: you cannot type anything on the command line itself to get yourself pre-authenticated to the remote system, nor avoid the login and password prompts that will pop up when you first connect! If you are going to use plain Telnet, you are going to have to somehow watch the incoming text for those two prompts (or however many the remote system supplies) and issue the correct replies Obviously, if systems vary in what username and password prompts they present, then you can hardly expect standardization in the error messages or responses that get sent back when your password fails That is why Telnet is so hard to script and program from a language like Python and a library like telnetlib.

Labels have their own declaration space, so the identifier in a labeled statement can be any valid identifier including those that might be declared in an overlapping scope, such as local variables or parameter names. For example, the following code shows the valid use of a label with the same identifier as a local variable: { int xyz = 0; ... xyz: Console.WriteLine("No problem."); } There are restrictions, however. The identifier cannot be either The same as another label identifier with an overlapping scope A keyword // Variable xyz // Label xyz

Unless you know every single error message that the remote system could produce to your login and password which might not just be its bad password message, but also things like cannot spawn shell: out of memory, home directory not mounted, and quota exceeded: confining you to a restricted shell your script will sometimes run into situations where it is waiting to see either a command prompt or else an error message it recognizes, and will instead simply wait forever without seeing anything on the inbound character stream that it recognizes So if you are using Telnet, then you are playing a text game: you watch for text to arrive, and then try to reply with something intelligible to the remote system.

Labeled statements cannot be seen (or accessed) from outside the block in which they are declared. The scope of a labeled statement is The block in which it is declared Any blocks nested inside that block For example, the code on the left of Figure 9-9 contains several nested blocks, with their scopes marked. There are two labeled statements declared in Scope B of the program: increment and end. The shaded portions on the right of the figure show the areas of the code in which the labeled statements are in scope. Code in Scope B, and all the nested blocks, can see and access the labeled statements. Code from any of the inner scopes can jump out to the labeled statements. Code from outside (Scope A, in this case) cannot jump into a block with a labeled statement.

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