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<H1><A NAME="SECTION001290000000000000000"></A>
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4.9 Program output
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<P>
Most programs write their results, including <I>PostScript</I> plots, to standard output.  The exceptions are those which may
create binary netCDF grid files such as <A NAME="tex2html1154"
  HREF="../man/surface.html"><I><B>surface</B></I></A><A NAME="19297"></A> (due to
the design of netCDF a filename must be provided; however,
alternative binary output formats allowing piping are available; see Section&nbsp;<A HREF="node72.html#sec:grdformats">4.17</A>).
With <I>UNIX</I> you can redirect standard output to a file or pipe it
into another process.  Error messages, usage messages, and
verbose comments are written to standard error in all cases.
You can use <I>UNIX</I> to redirect standard error as well,
if you want to create a log file of what you are doing. 

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<ADDRESS>
Paul Wessel
2010-07-14
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