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FTOOLS, a highly modular collection of utilities for processing and
analyzing data in the FITS (Flexible Image Transport System) format,
has been developed in support of the HEASARC (High Energy Astrophysics
Research Archive Center) at NASA's Goddard Space Flight Center. Each
utility performs a single simple task such as presentation of file
contents, extraction of specific rows or columns, appending or merging
tables, binning values in a column or selecting subsets of rows based
on a boolean expression. Individual utilities can easily be chained
together in scripts to achieve more complex operations such as the
generation and displaying of spectra or light curves. The collection
of utilities provides both generic processing and analysis utilities
and utilities common to high energy astrophysics data sets. The FTOOLS
software package is designed to be both compatible with IRAF and
completely stand alone in a UNIX or VMS environment. The user interface
is controlled by standard IRAF parameter files. The package is self
documenting through the IRAF help facility and a stand alone help task.
Software is written in ANSI C and FORTRAN to provide portability across
most computer systems. The data format dependencies between hardware
platforms are isolated through the FITSIO library package.