IDL "translation" by Josh Bloom (jsb@astro.caltech.edu)
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Setting paths:
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setenv IDL_DIR /usr/local/rsi/idl
setenv IDL_PATH \+$IDL_DIR/lib:\+$IDL_DIR/examples:\+$IDL_DIR/astron:\+$IDL_DIR\
/RaySterner:\+$IDL_DIR/WWB-unix:\+$IDL_DIR/TeXtoIDL:\+$IDL_DIR/external/astron:\
\+/home/totoro/jsb/Idl_stuff:\+$IDL_DIR/external/dust_map/CodeIDLNew:\+$IDL_DIR\
/external/dust_map/maps

setenv DUST_DIR $IDL_DIR/external/dust_map/maps
alias idl $IDL_DIR/bin/idl
setenv IDL_PATH +$IDL_DIR/deutsch:$IDL_PATH


Examples:
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 la_cosmic, 's120.fits',gain=1.0,readn=4.47,/isbig,blocksize=512

where s120.fits is a bias subtracted HST frame.  You can also do things like

 la_cosmic, '*.fits',gain=1.0,readn=4.47,/isbig,blocksize=512

which will reduce all the fits images in the directory.