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<H1><A NAME="SECTION00520000000000000000"> </A>
<A NAME="commands"> </A>
<BR>
Commands
</H1>
<P>
MIDAS is a command driven system in which the user enters commands
followed by parameters. This implies that the user must know a few
commands and their structure in order to make effective use of the
system. Since most users cannot keep all the commands and their parameters
at their finger tips, an extensive on-line help facility has been created
which can be used within the Midas terminal window as well as via a graphical
user interface.
<BR>
A MIDAS command has the following structure:
<P>
<BLOCKQUOTE>
<TT>COMMAND/QUALIFIER par1 par2 ... par8</TT></BLOCKQUOTE>where <TT>par1</TT> is the first parameter and so on. The important points are:
<UL>
<LI>Command and qualifier are separated by a <TT>/</TT> (slash).
<LI>The command/qualifier and the parameters are separated by a
<I>space</I>.
<LI>Most commands have qualifiers.
<LI>A parameter may contain several sub-parameters which are separated by
commas.
<LI>In most cases if the parameters are not specified, the system
makes sensible defaults, but the user should <B>not</B> always trust these
default values to be those he might have chosen.
<LI>Keep these rules in mind, otherwise you will confuse the command.
</UL>
<P></P>
MIDAS commands divide themselves into three categories:
<UL>
<LI>MIDAS basic (system) commands
<LI>MIDAS application commands
<LI>procedure control commands
</UL>All MIDAS commands are listed in alphabetical order and explained in
detail in help graphical user interface of MIDAS or can be found on the home
page of ESO Midas (web address: http://www.eso.org/projects/esomidas/). The
application commands are developed for special purposes such as CCD or
CASPEC reductions. They are described and listed in the various
sections related to particular applications. For reductions of data
you should refer to Volume B of this manual. The
commands for Midas procedures are described in Chapter <A HREF="node22.html#monitor-and-syntax">3</A>.
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-09</I>
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