INCLAN: Commands

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

• An optional comment, i.e. text following a comment sign “#”, is discarded.
• The values of variables are substituted from right to left.
• 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.
• If the command name matches a user-defined alias, the alias is expanded.
• If the command name matches a built-in command of INCLAN, it is executed by the command interpreter itself.
• Otherwise, if the command name matches a user-defined command (see INCLAN command command below), it is executed by the command interpreter.
• Otherwise, if the command name matches a command of the underlying program unambiguously, it is executed by the program.
• 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.