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Frida is written in FORTRAN 77. Hence it uses static memory allocation. Files are stored internally. Operation on
files changes them also only internally. In order to show details about these internally stored files, such as the
file number, their title, whether the have been manipulated in any way, etc., the directory commands starting with
the letter d are used.

  • df prints a directory of the files contained in the on-line memory to the screen. A typical printout can be
    found here.
  • dp prints data points of selected spectra to the screen. This includes there x and y values as well as the
    error bars. A typical printout can be found here. The command works in two different ways: If there is only
    a single spectrum contained in the file the dp command asks immediately for the number of channels
    (data points) that should be shown. In case of more than one spectrum, the user is first asked for the
    number of the spectrum and in a second stage for the number of the data points to be shown.
  • ds prints information of the spectra contained in the selected files. The information provided are the
    z-values for every single spectrum, the number of points and the x-range boundaries (minimum and
    maximum value). A typical output can be found here.
  • dz prints the z-values of selected files to the screen. A typical output can be found here.