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<TITLE>8.1 Introduction</TITLE>
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<A HREF="index.html"><FONT COLOR="#FFFFFF"><B>Reference</B></FONT></A><BR>
<A HREF="intro.html"><FONT COLOR="#FFFFFF">1 Introduction</FONT></A><BR>
<A HREF="interface.html"><FONT COLOR="#FFFFFF">2 Interface</FONT></A><BR>
<A HREF="scanner.html"><FONT COLOR="#FFFFFF">3 Scanner</FONT></A><BR>
<A HREF="parser.html"><FONT COLOR="#FFFFFF">4 Parser</FONT></A><BR>
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<A HREF="tangle.html"><FONT COLOR="#FFFFFF">6 Tangle</FONT></A><BR>
<A HREF="weave.html"><FONT COLOR="#FFFFFF">7 Weave</FONT></A><BR>
<A HREF="shell.html"><FONT COLOR="#FFFFFF">8 Shell</FONT></A><BR>
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<P><FONT SIZE="5">8.1 Introduction</FONT><BR>
<P>One of the goals of FunnelWeb is that it must be
extremely portable, and a significant effort has gone into
achieving this.
<P>An equally important goal was that of correctness and
reliability. To this end, it was determined that a large
automated suite of test programs be prepared to assist in
regression testing. Preparing the test suite was tedious,
but achievable. Automating it portably was more difficult.
<P>The difficulty faced was that if FunnelWeb was
implemented in the form of a utility that could be invoked
from the operating system command language, the only way to
set up regression testing was in the command language of the
operating system of the target machine (shellscripts for
UNIX, DCL for OpenVMS, batch files for MSDOS, and
<I>nothing</I> on the Macintosh). The huge variation in
these command languages led to the conclusion that either
the automation of regression testing would have to be
rewritten on each target machine, or a small command
language would have to be created within FunnelWeb. In the
end, the twin goals of portability and regression testing
were considered so important that a small command shell was
constructed inside FunnelWeb. This is called the
<STRONG>FunnelWeb command shell</STRONG>, or just "the
shell" for short.
<P>By default, when FunnelWeb is invoked, it does not
enter its shell. If just given the name of an input file, it
will simple process the input file in the normal manner and
then terminate. To instruct FunnelWeb to invoke its shell,
the <SAMP>+K</SAMP> or <SAMP>+X</SAMP> command line option must be
specified when FunnelWeb is invoked from the operating
system. It is also invoked upon startup if the file
<SAMP>fwinit.fws</SAMP> exists.
<P>Most FunnelWeb users will never need to use the shell
and need not even know about it. There are four main uses of
the shell:
<OL>
<LI> As a tool to support automated regression testing.
<LI> As a development tool on machines that do not have a
built in shell (e.g. the Macintosh). The shell can be used
to process whole groups of files automatically.
<LI> As a convenience. A user working on a multi-tasking,
multi-window workstation may wish to
keep an interactive session of FunnelWeb going in one window
rather than having to run up the utility each time it is
required.
<LI> As a convenient vehicle for enclosing utilities. The
FunnelWeb shell contains useful general purpose commands
such as the differences command <SAMP>diff</SAMP>.
</OL>
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