X Windows Configuration Setup for Using NAG

The document NAG Fortran Library contains an overview of NAG and information on its use that should be read prior to reading this document.

The most efficient way to do program development with NAG on Strauss is to use a workstation that functions as an X Windows server. This type of workstation includes SunRays, Microsoft Windows systems using XMING and UNIX workstations. In these multi-windowed environments, you can open several windows at once—a documentation window, an editor window and a compile/run window.

This document assumes that you have already modified your UNIX configuration files as described in the document Getting Started with NAG: Setting Up Your UNIX Account . Further modifications to these configuration files, described below, will facilitate your use of NAG in an X Windows environment.

Modifying your alias file

The commands nagxterm and nagstrauss will open an xterm window just for working with NAG. When you are done with that window, close it or type exit. The command nagxterm only works on Strauss; nagstrauss will works on any Unix machine with ssh X tunneling enabled.

Add the following lines to the file called ~/.alias, which may not exist.

if $?DISPLAY then 
  alias nagxterm '(setenv NEED_NAG; xterm -name commands &)' 
  alias nagstrauss\ 
    ssh -X -f strauss.udel.edu 'setenv NEED_CTT\; xterm -name commands' 
endif

These three new commands will become defined when you start a new shell or open an new xterm window.

Modifying your X defaults file

The commands in the previous section all start an xterm with the name "commands." This is where you type commands to compile and run your program. Compiling and running your program may produce more lines of output than fit in a normal sized window. You may want to configure your X defaults so any window named "commands" has more lines on the screen and more lines in the save buffer for scrolling.

Add the following lines to your ~/.Xdefaults-strauss.udel.edu file on Strauss.

commands.VT100.Foreground: DarkSlateBlue 
commands.VT100.Background: lightGray 
commands.VT100.geometry:  80x48
commands.VT100.saveLines: 4800
commands.VT100.ScrollBar: true
                          

Now, any xterm on Strauss with the name "commands" will have these resources set. The window will be 48 lines long and 4800 lines (100 pages) will be saved in the scrollback buffer. You can use the scrollbar, or you can use the Page Up, Page Down, Home and End keys to display all the saved lines.

It is recommended that you edit the source or data files from another window. That way, the normal output will not be interrupted with full screen edit lines.

Connecting to Strauss from your local desktop

Here are the three steps to start an xterm on Strauss:

1. Select an X11 windows server:
   You will need an X11 server on your local desktop. Start XMING on a Windows PC or start the X11 application package on a Mac OS X. Local X Windows desktops such as Gnome, KDE or CDE are based on X11, so you do not need to start a new X11 server.
2. Use an SSH client to connect to Strauss:
   Type ssh -X username@strauss.udel.edu replacing username with your UDelNet ID. On a Windows PC, use the University-supplied SSH client to connect to Strauss with X11 tunneling enabled.
3. Open a NAG xterm window:
   Type nagxterm

These last two steps can be accomplished with one command:

ssh -X -f username@strauss.udel.edu 'setenv NEED_NAG\; xterm -name commands'

Use this command to customize your desktop for quickly opening a NAG-configured xterm on Strauss.