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Top Forums UNIX for Dummies Questions & Answers question Post 51004 by wannabe_guru on Friday 7th of May 2004 07:43:16 PM
Old 05-07-2004
more help,

HI guys, im revising for an exam if anyone is wondering, I typed the following

grep King MagnaCarta.txt
echo grep King MagnaCarta.txt
`echo grep King MagnaCarta.txt`

the first one gets me the sentence in which King is mentioned
second one just prints out grep King MagnaCarta.txt

the third one displays a msg saying
echo grep King MagnaCarta.txt: Command not found

Why does it do that? What do the single quotes change in the code??
 

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QUIZ(6) 							 BSD Games Manual							   QUIZ(6)

NAME
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 The default index and data files. BUGS
quiz is pretty cynical about certain subjects. BSD
May 31, 1993 BSD
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