Changing System Defaults

On some systems, certain defaults may be changed prior to starting the software. Some common examples are[2]Note that I use the `;:' construct for Unix in-line comments.:

% setenv SHELL /bin/csh ;: Invokes csh via ICL `sh' command
% setenv TERM vt100 ;: Required by DEC-Alphas?
% setenv LPDEST hp3d ;: Where `hp3d' is a PostScript printer
% setenv CGS4_MASKS /scratch/pnd/19940811 ;: User's bad pixel masks

The last option allows user defined bad pixel masks e.g. when reducing echelle data. If the user requires system defined bad pixel masks as well these must be manually copied to the new directory before the software is invoked. For example, to use fpa46_short and one's own masks enter:

% setenv CGS4_MASKS /scratch/pnd/19940811/masks
% cp -p $cgs4dr_root/ndf/fpa46_short.sdf $cgs4_masks/fpa46_short.sdf
% cgs4dr /scratch/pnd/19940811 940811 ndf