IRAF has special syntax to append/replace, so you can do something like: imarith *.fits - dark.fits ds_//*.fits ...though I can't remember right now how to do replacement etc.
MOSAIC data reduction
MOSAIC reduction is very difficult. http://www.noao.edu/noao/noaodeep/ReductionOpt/frames.html has the official instructions. Important things: Have the latest version of MSCRED and MSCDB installed. Both will give cryptic errors or "cannot open file" errors (because the files don't exist) otherwise. mscredsetinstrument kpno CCDMosaThin1msccmatch obj09*.fits coords="!mscgetcat $I $C" search=60 rsearch=1 nfit=30 accept=yes interactive=no fit=no
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