General structure

The MIDAS system is built as a hierarchical directory tree containing installation procedures, source code and documentation      . The top directory is named after the release month (e.g. 90NOV for the November release of 1990) and is put directly under the MIDAS home directory. New releases can be added as additional branches under the MIDAS home directory. Both the MIDAS home directory   and the top directory must be stored in environment variables^2.1. MIDASHOME should contain the MIDAS home directory (e.g. /home/ns2b/midas for UNIX); MIDVERS should contain the name of the top directory of the release (e.g. 91NOV).

In this chapter, the local path of a MIDAS release is abbreviated as Mv which is $MIDASHOME/$MIDVERS for UNIX or MID_DISK:['MIDASHOME'.'MIDVERS'] for VAX/VMS where MID_DISK is the logical name to the disk. The UNIX style for the directory path of files is used in this chapter (e.g. /midas/94NOV/doc/env) rather than VAX/VMS style. In the following subsections the main directory structure and naming conventions for files are explained.