% @(#)drs.help	17.1.1.1 (ESO-IPG) 01/25/02 17:43:33 
Use drs (Data Reduction System) from the Unix command line as: 
  
drs [-d(ebug)] [-u(pdate)] [-f(its output)] Midas_command
  
   for option = d, the command sent to Midas is printed again
  
   by default FITS files are not updated in Midas (for backw. compatibility)
   for option = u, also FITS files are updated
   Midas (.bdf) files are always updated
  
   for option = f, all result frames are created in FITS format
  
drs -h 
   to get this text
  
Due to the shell expansion mechanism, 
characters like e.g. `*' or `)' have to be entered as `\*', `\)' 
or the whole string must be enclosed in `"' (double quotes).
  
Examples:
  
1) read all FITS keywords beginning with `ST' of a FITS file
  
$ drs read/descr image.fits st\*
     or
$ drs read/descr image.fits "st*"
  
  
  
2) delete all ESO hierarchical FITS keywords of FITS file image.fits 
  
$ drs -u delete/descr image.fits ESO.\*

  the command above triggers the following processing:
  the FITS file is converted to internal Midas format (all in memory)
  in the conversion all `HIERARCH ESO abc xyz keywords are translated into
  descriptors  `ESO.abc.xyz'
  all descriptors beginning with the string `ESO.' are deleted
  the file is written out in FITS again
  
  note, that the "-u" flag is needed, otherwise the FITS file is NOT updated