![]() Since the individual tasks of the FITSH package handles this format, we recommend this program to display images. The SAOImage/DS9 is the most widely used utility to display and analyze astronomical images that are stored in FITS format. Gnuplot is a portable command-line driven plotting utility and can be used to easily visualize the numerical data outputs of the FITSH tasks. In order to ensure the usage of bash, just start your executable scripts with #!/bin/bash instead of #!/bin/sh (see also the examples section here). Please note that on certain systems, the default shell, /bin/sh not evidently refers the bash shell and hence some features (loops, arrays) work differently. Many features of this shell is known by all of Linux or UNIX users, however, we recommend to get familiar with other features, such as conditional or iterative loops, variable definitions, arrays and function declarations as well. Although the FITSH tasks can be executed from any kind of environment, these tasks were designed to be run from bash. The GNU Bourne-Again SHell, known as bash is one of the most well-known shells found on Linux or UNIX-like operating systems, and it is a de facto standard among the various kind of system shells. In addition these packages are not only free and open source packages but available for almost all of Linux, Mac/OSX or UNIX-like systems as well as on MS/Windows. Of course, you may choose any of your favorite packages or programming environments (for instance, Python or IDL has many of these additional features), but the examples featured in this website mainly expects that these ones are also available in your computer system. Hence, before and/or after installing FITSH, it is advised to get familiar with the following additional packages as well. Indeed, FITSH is intended to process the images themselves, however, the package does not contain any utilities to display them or any additional tools for plotting or visualization. In order to get familiar with the FITSH package, we recommend to start your work somehow similar to the following.
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