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General Structure of Software Directories

Directories containing Compact Array software files are grouped into a number of logical areas. These are as follows:
  • AT$ - Executable images, command procedures and data files necessary for array operation.

  • LIB$ - Software libraries to which programs in the OBS$ area link.

  • OBS$ - Software development areas for executable on-line and off-line programs.

  • SYS$ - VMS system maintenance and service files.

  • USR$ - Personal directories for observatory staff and visitors.

  • UTL$ - Utility programs not required for array operation.
AT$
Each of the AT$ areas is named according to its contents
Eg.
AT$RUN - Executables
AT$LOG - Log files
AT$ANTENNA - Antenna related files
AT$SCHED - Schedule files
AT$CAT - Catalogues
Click here for a full list of the AT$ areas.

LIB$
There can be as many LIB$ areas as there are disks. These are designated LIB$1, LIB$2,..., LIB$n.
At present only LIB$1 exists.
Within each LIB$n area are a number of directories, each named after and containing a particular software library, for example, LIB$:[ATE], LIB$:[MENU] and LIB$:[TIM].

The structure of each LIB$[XXX] is as follows: The top level directory of a library (LIB$[XXX]) should contain the library file XXXLIB.OLB and the two directories: LIB$[XXX.WORK] and LIB$[XXX.CODE] .

Directory tree for LIB$ areas

OBS$
As with the libraries, there can be a number of OBS$ areas, depending on their physical location. Each major program has its own subdirectory within this, and is at the top of a directory tree of the form given below.
Examples of program units stored in the OBS$ area include ARRAY, CAOBS and CAMON.

SYS$
The SYS$ device holds files required for system operation and maintenance.

UTL$
This area has not yet been implemented, but it is envisaged that it will contain utility programs which do not fall into any of the other categories.
Examples include many of the files currently residing in SYS$UTILITY:. Eg. kermit, xeyes, etc.

Directories Containing Source Code

Directory trees which hold source code are structured as per the following diagram:

Directory tree for OBS$:[ARRAY]

The top level directory (ARRAY in the example) has two subdirectories: [ARRAY.WORK], where development occurs and working files are kept, and [ARRAY.CODE] which holds the CMS (Code Management System) directory structure.

Original: nmckay (23-Feb-1995)
Modified: nmckay (9-Oct-1995)