On all UNIX systems, X-PLOR provides the feature of environmental variables. Suppose the user has defined a UNIX variable TOPPAR in his or her “.cshrc" file
setenv TOPPAR  /user/toppar
Then it is possible to access a file “xyz" in the directory “/user/toppar" in X-PLOR by specifying the filename “TOPPAR:xyz", e.g., if the user wants to set the DISPLay file,
Here is an example of reading from a file using the environment variables:
PARA @TOPPAR:parallhdg_new.pro

Xplor-NIH 2023-11-10