INCLAN: Commands

When reading an input command line the command interpreter executes the following steps:

1. An optional comment, i.e. text following a comment sign “#”, is discarded.
2. The values of variables are substituted from right to left.
3. The command line is split into elements, defined as sequences of non-blank characters separated by blank characters. The first element becomes the command name. The following elements become command parameters.
4. If the command name matches a user-defined alias, the alias is expanded.
5. If the command name matches a built-in command of INCLAN, it is executed by the command interpreter itself.
6. Otherwise, if the command name matches a user-defined command (see INCLAN command command below), it is executed by the command interpreter.
7. Otherwise, if the command name matches a command of the underlying program unambiguously, it is executed by the program.
8. Otherwise, the command interpreter looks for a macro with the given command name and, if it is found in the current macro search path, executes it. If no such macro is found, an error occurs.