Basic Information on gethd

Task: gethd
Purpose: Print the value of a header item.
Categories: miscellaneous

        GetHd simply prints the value of a header item. Its main use will
        be in scripts, where it can be used to extract information from
        the image header.

Key: in
        The name of an item within a dataset. This is given in the form
          in=dataset/item
        There is no default. The dataset may be either a uv or image data-set.

Key: format
        For numeric values, this determines the way that the output value
        is converted and formated. Possible values are:
          default   No conversion. This is the default.
          time      The value is assumed to be a Julian day, and is formatted
                    into Miriad's date format.
          pol       The value is assumed to be a polarization tag, and is
                    formatted as I,Q,U,V,XX,YY, etc.
        The following assume that the value is in radians.
        Note that for bpa this assumption is incorrect, it is stored as
        degrees and should be retrieved with format left empty.
          arcsec    The value is converted to arcsec.
          arcmin    The value is converted to arcmin.
          degrees   The value is converted to degrees.
          hours     The value is converted to hours.
          hms       The value is formatted as hh:mm:ss.
          dms       The value is formatted as dd:mm:ss.

Key: log
        Output log file. Default is the terminal.