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Test Your Knowledge in Computers #946
Difficulty: Medium
A ping flood attack is a simple DOS attack where the attacker overwhelms the victim with TCP echo request packets.
True or False?
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learn(1) [bsd man page]

LEARN(1)						      General Commands Manual							  LEARN(1)

learn - computer aided instruction about UNIX SYNOPSIS
learn [ -directory ] [ subject [ lesson ] ] DESCRIPTION
Learn gives Computer Aided Instruction courses and practice in the use of UNIX, the C Shell, and the Berkeley text editors. To get started simply type learn. If you had used learn before and left your last session without completing a subject, the program will use information in $HOME/.learnrc to start you up in the same place you left off. Your first time through, learn will ask questions to find out what you want to do. Some questions may be bypassed by naming a subject, and more yet by naming a lesson. You may enter the lesson as a number that learn gave you in a previous session. If you do not know the lesson number, you may enter the lesson as a word, and learn will look for the first lesson containing it. If the lesson is `-', learn prompts for each lesson; this is useful for debugging. The subject's presently handled are files editor vi morefiles macros eqn C There are a few special commands. The command `bye' terminates a learn session and `where' tells you of your progress, with `where m' telling you more. The command `again' re-displays the text of the lesson and `again lesson' lets you review lesson. There is no way for learn to tell you the answers it expects in English, however, the command `hint' prints the last part of the lesson script used to evaluate a response, while `hint m' prints the whole lesson script. This is useful for debugging lessons and might possibly give you an idea about what it expects. The -directory option allows one to exercise a script in a nonstandard place. FILES
/usr/share/learn subtree for all dependent directories and files /usr/tmp/pl* playpen directories $HOME/.learnrc startup information SEE ALSO
csh(1), ex(1) B. W. Kernighan and M. E. Lesk, LEARN - Computer-Aided Instruction on UNIX BUGS
The main strength of learn, that it asks the student to use the real UNIX, also makes possible baffling mistakes. It is helpful, espe- cially for nonprogrammers, to have a UNIX initiate near at hand during the first sessions. Occasionally lessons are incorrect, sometimes because the local version of a command operates in a non-standard way. Occasionally a lesson script does not recognize all the different correct responses, in which case the `hint' command may be useful. Such lessons may be skipped with the `skip' command, but it takes some sophistication to recognize the situation. To find a lesson given as a word, learn does a simple fgrep(1) through the lessons. It is unclear whether this sort of subject indexing is better than none. Spawning a new shell is required for each of many user and internal functions. The `vi' lessons are provided separately from the others. To use them see your system administrator. 7th Edition October 22, 1996 LEARN(1)

Check Out this Related Man Page

QUIZ(6) 							 BSD Games Manual							   QUIZ(6)

quiz -- random knowledge tests SYNOPSIS
quiz [-t] [-i file] [question answer] DESCRIPTION
The quiz utility tests your knowledge of random facts. It has a database of subjects from which you can choose. With no arguments, quiz displays the list of available subjects. The options are as follows: -t Use tutorial mode, in which questions are repeated later if you didn't get them right the first time, and new questions are presented less frequently to help you learn the older ones. -i Specify an alternative index file. Subjects are divided into categories. You can pick any two categories from the same subject. quiz will ask questions from the first cate- gory and it expects answers from the second category. For example, the command ``quiz victim killer'' asks questions which are the names of victims, and expects you to answer with the cause of their untimely demise, whereas the command ``quiz killer victim'' works the other way around. If you get the answer wrong, quiz lets you try again. To see the right answer, enter a blank line. Index and Data File Syntax The index and data files have a similar syntax. Lines in them consist of several categories separated by colons. The categories are regular expressions formed using the following meta-characters: pat|pat alternative patterns {pat} optional pattern [pat] delimiters, as in pat[pat|pat]pat In an index file, each line represents a subject. The first category in each subject is the pathname of the data file for the subject. The remaining categories are regular expressions for the titles of each category in the subject. In data files, each line represents a question/answer set. Each category is the information for the question/answer for that category. The backslash character (``'') is used to quote syntactically significant characters, or at the end of a line to signify that a continuation line follows. If either a question or its answer is empty, quiz will refrain from asking it. FILES
/usr/share/games/quiz.db The default index and data files. BUGS
quiz is pretty cynical about certain subjects. BSD
May 31, 1993 BSD

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