The CI is an executable program that acts as an interface between the
user and MPE/iX.
It consists of two parts: a centralized scanner/parser that scans a command string for valid syntax, and an interpreter that invokes the appropriate command executor based on command input.
The scanner/parser analyzes the command string for proper syntax. If the syntax is incorrect, it is returned for correction. If correct, the command string is passed to the interpreter portion of the CI.
The interpreter identifies the command as a user-defined command, predefined system command, program file, or command file. It then invokes the appropriate procedure to process the command or to run the specified program file or command file.
The CI and many of its commands operate on HFS (hierarchical file
system) file names and directories. In addition, several commands are
dedicated to operations on HFS files and directories. Refer to
New Features of MPE/iX: Using The
Hierarchical File System
(32650-90351) and to
MPE/iX Commands Reference Manual
(32650-90003).
In addition, a CM (compatibility mode) command (plus its parameters
and objects) can consist of 253
characters for commands invoking a relative pathname; or it can
consist of as many as 255 characters for commands invoking an absolute
path name. The maximum size for native mode commands is 511
characters, less the length of the command and and other parameters.
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If a POSIX (HFS) object is directly under root or an MPE group, its
name length is reduced to a maximum of 16 characters.
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