reidentify

    reference =                 Reference image
       images =                 Images to be reidentified
       answer = "yes"           Fit dispersion function interactively?
        crval =                 Approximate coordinate (at reference pixel)
        cdelt =                 Approximate dispersion
 (interactive = "no")           Interactive fitting?
     (section = "middle line")  Section to apply to two dimensional images
      (newaps = yes)            Reidentify apertures in images not in reference
    (override = no)             Override previous solutions?
       (refit = yes)            Refit coordinate function?\n
       (trace = no)             Trace reference image?
        (step = "10")           Step in lines/columns/bands for tracing an imag
        (nsum = "10")           Number of lines/columns/bands to sum
       (shift = "0.")           Shift to add to reference features (INDEF to se
      (search = 0.)             Search radius
       (nlost = 0)              Maximum number of features which may be lost\n
     (cradius = 5.)             Centering radius
   (threshold = 0.)             Feature threshold for centering
 (addfeatures = no)             Add features from a line list?
   (coordlist = "/astro/users/ben/premap/calibration/idhenear.dat")     User coordinate list
       (match = -3.)            Coordinate list matching limit
 (maxfeatures = 100)            Maximum number of features for automatic identi
      (minsep = 2.)             Minimum pixel separation\n
    (database = "database")     Database
    (logfiles = "logfile")      List of log files
    (plotfile = "")             Plot file for residuals
     (verbose = no)             Verbose output?
    (graphics = "stdgraph")     Graphics output device
      (cursor = "")             Graphics cursor input\n
     (aidpars = "")             Automatic identification algorithm parameters
        (mode = "ql")           

NOTE:

It is generally a good idea to fit the dispersion function interactively 
so that you cna keep an eye on what's going on. Hence the parameter setting

answer = yes

If for some reason you want the fits to be done automatically without your
intervention, then set

answer = no

and you will get what you deserve.