Configuration and Initialization Customizing the Command Set
RTEMS Shell User's Guide
1.2.1: Customizing the Command Set
The user can configure specific command sets by either building
up the set from individual commands or starting with a complete
set and disabling individual commands. Each command has two
configuration macros associated with it.
CONFIGURE_SHELL_COMMAND_XXX
Each command has a constant of this form which is defined when
building a command set by individually enabling specific
commands.
CONFIGURE_SHELL_NO_COMMAND_XXX
In contrast, each command has a similar command which is
defined when the application is configuring a command set
by disabling specific commands in the set.
RTEMS Shell User's Guide