Besides the fact that all the programs share some functions that were
explained in Library, everything else about each program is
completely independent. Recall that Gnuastro is written for an active
astronomer/scientist (not a passive one who just uses a software). It must
thus be easily navigable. Hence there are fixed source files (that contain
fixed operations) that must be present in all programs, these are discussed
fully in Mandatory source code files. To easily understand the
explanations in this section you can use The TEMPLATE program which
contains the bare minimum code for one working program. This template can
also be used to easily add new utilities: just copy and paste the directory
and change TEMPLATE with your program’s name.
GNU Astronomy Utilities 0.20 manual, April 2023.