Mail Archives: djgpp/1998/08/04/16:37:24
"Rylan" <rylan AT intekom DOT co DOT za> wrote:
> I'm still very new to the DJGPP world. I've asked these questions before but
> I have never been able to find a satisfactory answer:
>
> 1) What is bash?
A powerfull shell for UNIX.
> What do you use it for?
The same that command.com, but the differences are as huge as the differences
between UNIX and DOS.
In djgpp is useful because you can run scripts designed for UNIX, they are
used to configure packages (for example). Imagine batch files but 100 times
more powerfull.
> 2) I know that flex is a "lexical analyzer". What's that?! What do you use
> it for?
Suppose you want to write a compiler, you know that the "things" you'll have
are: numbers, variables, etc. Well... how can you separate the text in these
categories? you can do it with a lexical analyzer.
> 3) YACC (yet another compiler compiler) - ok? What is a "compiler compiler"?
A tool to compile something that will be a compiler. A compiler of compilers.
> Why do you want to use it?
Ones you separated numbers, variables, etc. You can go farther and analyze
what the things are to then compile. For example:
a=10;
Flex will see a variable, a symbol and a number, then you define a rule that
says how to assign a value to a variable. How? Using bison (the GNU yacc).
> For what?
Compilers, interpreters, etc.
> Any replies appreciated! Please reply by mail if at all possible.
I'm doing that but one mail I sent you was rejected :-(
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