iraf-appendprependreplace.html

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         title="Permalink to IRAF append/prepend/replace">IRAF append/prepend/replace</a></h2>
 
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    <abbr class="published" title="2012-09-20T20:02:00-06:00">
      2012/09/20
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      By <a class="url fn" href="https://keflavich.github.io/blog/author/adam-keflavichgmailcom.html">Adam (keflavich@gmail.com)</a>
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    <p>IRAF has special syntax to append/replace, so you can do something like:
<tt class="docutils literal">imarith *.fits - dark.fits <span class="pre">ds_//*.fits</span></tt>
...though I can't remember right now how to do replacement etc.</p>

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