how to generate barcode in asp.net c# TELNET AND SSH in Font

Paint QR in Font TELNET AND SSH

CHAPTER 16 TELNET AND SSH
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It is even more common for programs to adjust their output based on whether they are talking to a terminal. If a user might be watching, they want each line, or even each character, of output to appear immediately. But if they are talking to a mere file or pipe, they will wait and batch up large chunks of output and more efficiently send the whole chunk at one time.
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Both of the last two issues, which involve buffering, cause all sorts of problems when you take a process that you usually do manually and try to automate it because in doing so you often move from terminal input to input provided through a file or pipe, and suddenly you find that the programs behave quite differently, and might even seem to be hanging because print statements are not producing immediate output, but are instead saving up their results to push out all at once when their output buffer is full. You can see this easily with a simple Python program (since Python is one of the applications that decides whether to buffer its output based on whether it is talking to a terminal) that prints a message, waits for a line of input, and then prints again: $ python talk: hi you said $ python hi talk: you said -c 'print "talk:"; s = raw_input(); print "you said", s' hi -c 'print "talk:"; s = raw_input(); print "you said", s' | cat hi
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You can see that in the first instance, when Python knew its output was a terminal, it printed talk: immediately. But in the second instance, its output was a pipe to the cat command, and so it decided that it could save up the results of that first print statement and batch them together with the rest of the program's output, so that both lines of output appeared only once you had provided your input and the program was ending. The foregoing problem is why many carefully written programs, both in Python and in other languages, frequently call flush() on their output to make sure that anything waiting in a buffer goes ahead and gets sent out, regardless of whether the output looks like a terminal. So those are the basic problems with terminals and buffering: programs change their behavior, often in idiosyncratic ways, when talking to a terminal (think again of the ls example), and they often start heavily buffering their output if they think they are writing to a file or pipe.
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Terminals Do Buffering
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Beyond the program-specific behaviors just described, there are additional problems raised by terminals. For example, what happens when you want a program to be reading your input one character at a time, but the Unix terminal device itself is buffering your keystrokes to deliver them as a whole line This common problem happens because the Unix terminal defaults to canonical input processing, where it lets the user enter a whole line, and even edit it by backspacing and re-typing, before finally pressing Enter and letting the program see what he or she has typed. If you want to turn off canonical processing so that a program can see every individual character as it is typed, you can use the stty Set TTY settings command to disable it: $ stty -icanon Another problem is that Unix terminals traditionally supported a pair of keystrokes for pausing the output stream so that the user could read something on the screen before it scrolled off and was
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CHAPTER 16 TELNET AND SSH
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replaced by more text. Often these were the characters Ctrl+S for Stop and Ctrl+Q for Keep going, and it was a source of great annoyance that if binary data worked its way into an automated Telnet connection that the first Ctrl+S that happened to pass across the channel would pause the terminal and probably ruin the session. Again, this setting can be turned off with stty: $ stty -ixon -ixoff Those are the two biggest problems you will run into with terminals doing buffering, but there are plenty of less famous settings that can also cause you grief. Because there are so many and because they vary between Unix implementations the stty command actually supports two modes, cooked and raw, that turn dozens of settings like icanon and ixon on and off together: $ stty raw $ stty cooked In case you make your terminal settings a hopeless mess after some experimentation, most Unix systems provide a command for resetting the terminal back to reasonable, sane settings (and note that if you have played with stty too severely, you might need to hit Ctrl+J to submit the reset command, since your Return key, whose equivalent is Ctrl+M, actually only functions to submit commands because of a terminal setting called icrnl!): $ reset If, instead of trying to get the terminal to behave across a Telnet or SSH session, you happen to be talking to a terminal from Python, check out the termios module that comes with the Standard Library. By puzzling through its example code and remembering how Boolean bitwise math works, you should be able to control all of the same settings that we just accessed through the stty command. This book lacks the space to look at terminals in any more detail (since one or two chapters of examples could easily be inserted right here to cover all of the interesting techniques and cases), but there are lots of great resources for learning more about them a classic is 19, Pseudo Terminals, of W. Richard Stevens' Advanced Programming in the UNIX Environment.
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