HP Fortran Programmer's Guide (B3908-90031; September 2011)

An overview of HP Fortran
HP-UX operating system
Chapter 1 19
HP-UX operating system
Although the HP-UX operating system does not appear in Figure 1-1 on page 3, it provides a variety of
resources for programs executing within HP-UX. For example, HP-UX captures the command line you use
to invoke an executable program, breaks it up into arguments, and makes them available to your program.
HP-UX also has many callable system routines that provide low-level access to kernel-level resources. For
example, your program can call HP-UX file-processing routines as alternatives to Fortran I/O.
“Writing HP-UX applications” on page 173 discusses how HP Fortran programs can take advantage of
HP-UX resources. For a full description of HP-UX system routines, see the HP-UX Reference.