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Copyright (c) Ross N. Williams 1992,1999. All rights reserved.
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<TITLE>8.6 Options</TITLE>
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<A HREF="index.html"><FONT COLOR="#FFFFFF"><B>Reference</B></FONT></A><BR>
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<A HREF="intro.html"><FONT COLOR="#FFFFFF">1 Introduction</FONT></A><BR>
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<A HREF="interface.html"><FONT COLOR="#FFFFFF">2 Interface</FONT></A><BR>
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<A HREF="weave.html"><FONT COLOR="#FFFFFF">7 Weave</FONT></A><BR>
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<A HREF="shell.html"><FONT COLOR="#FFFFFF">8 Shell</FONT></A><BR>
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<A HREF="glossary.html"><FONT COLOR="#FFFFFF">10 Glossary</FONT></A><BR>
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<P><FONT SIZE="5">8.6 Options</FONT><BR>
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<P>The FunnelWeb shell maintains three sets of command
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<LI> The set of options resulting from applying the
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operating system level command line arguments to the default
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<LI> A set of shell options that prevail during the shell
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<LI> The set of option values active during a particular
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invocation of FunnelWeb proper.
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<P>When FunnelWeb is invoked from the operating system
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with just <SAMP>+F</SAMP>, only the first of these three sets
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comes into existence. If the user invokes the FunnelWeb
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shell, the shell options come into existence and are
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initialized with the value of the first set. These shell
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options are used as the default for all subsequent
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<SAMP>fw</SAMP> commands. However, they can be altered using
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the script command <SAMP>set</SAMP>. If a <SAMP>fw</SAMP> command
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executed in a shell contains additional command line
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options, these override the shell options for that run, but
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do not change the shell options. An example follows:
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$ fw +k +t ! Original invocation from OS.
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! Options default with "+t".
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FunnelWeb>fw sloth ! Equivalent to fw sloth +t.
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FunnelWeb>set -l ! Change the l shell option.
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FunnelWeb>fw sloth +q ! Equiv to fw sloth +t -l +q.
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FunnelWeb>fw sloth ! Equiv to fw sloth +t -l.
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<P>The existence of the shell option set means that the
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user can set up a set of defaults to be applied to all
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<SAMP>fw</SAMP> commands issued within the shell.
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