14.1 Listing file headers

A XAS file has a header composed by a list of keywords, which are normally used programmatically.
It is also possible to list the entire header at the terminal using the command

hlist [ file

which produces a listing of the form given below. It is also possible to use standard operating system facilities to redirect the output to a file, or to restrict the output to a limited subset of keywords (e.g. for Unix users hlist file > outfile or hlist file | grep keyword.

This is an example of the output. The type of each keyword is indicated (before its name and value) using codes

(C) character (string)
(I) 16-bit integer (INTEGER*2, use discouraged)
(J) 32-bit integer (INTEGER*4)
(R) 32-bit floating point (REAL*4)
(D) double precision floating point (REAL*8)

 File prova.spectrum                           of type SPE
 Record length                                 16 bytes
 Mini-header records                            2
 Data        records                          256
 Full header records                           73
------------------------------------------------------------------------

 (J) BITPIX       =            8
 (J) NAXIS1       =           16
 (J) NAXIS2       =          256
 (J) TFIELDS      =            4
 (C) FILENAME     = prova_spectrum
 (C) OBSERVER     = SAX TEAM (OP_884
 (C) OBJECT       = Crab

omissis...

 (C) PACKET       = m1dir002
 (J) NPACKET      =         3235
 (D) EXPOSURE     =  4554.62890625
 (C) HISTORY      = saxhaccum prova m1dir002 PHA 0 255 1 1996 9 6 19 51 9 1996 9 6 21
 (C) HISTORY      = + 17 20 27 60 0 255 0 255
 ------------------------------------------------------------------------
 For a total of     48 keywords

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sax.iasf-milano.inaf.it/Xashelp/handle.1.html :: original creation 2002 Sep 04 18:10:50 CEST :: last edit 2002 Sep 04 18:10:50 CEST