<cl> (stella) Type ? for help. Stella [Top-Level]:
Stella [Top-Level]:The new prompt consists of the name of the editor followed by the name of the current "focus object" printed inside square brackets []. The focus object provides a selection context. Think of the editor as being "inside" the focus object. The focus object is important because it allows other objects to be selected based on their position(s) relative to the current focus. Stella has a number of commands for moving to a new focus object. Whenever the focus changes the [] portion of the prompt is updated to display the name of the new focus. When Stella first starts up its focus is Top-Level, a system container holding all the user's containers. Much more about this later.
Stella [Top-Level]: ? ? Show this help. ADD Add objects to container. ARCHIVE Archive objects to file. CHANGE Change the class of objects. [... rest of help listing deleted] Use the HELP command for detailed help about the commands summarized above, or to see overviews about the following general topics: REFERENCING INTERPRETER EXPRESSIONS. Stella [Top-Level]:Stella's on-line help facility includes both short and long help. To see short help use the ? command. Use help to see long help about a particular command or topic. For example, to read documentation about the help command itself, type:
Stella [Top-Level]: help help HELP {topic} Arguments: {topic} Command name or topic. Overview: The HELP command displays detailed help about {topic}, which may be a command name or a general topic. For a listing of available commands and topics use the ? command. See also: ? Stella [Top-Level]:Try using help on several commands, for example show, list, or map.
Stella [Top-Level]: help helpcould be typed:
Stella [Top-Level]: he hebecause he is enough to uniquely identify help in the full command set.
Stella [Top-Level]: help helpthe first help is the name of the command, and the second help is a command argument, in this case the name of a command to read help about.
Stella [Top-Level]: help Help topic: help [help text omitted] Stella [Top-Level]:The global variable *command-prompting* enables or disables interactive command prompting. Set *command-prompting* to nil to make the interpreter behave more "tersely", like a UNIX shell.
command references arg1 ... argnwhere command is the name of the command, references are the names or positions of one or more objects separated by comma and arg1 through argn are additional command arguments.
Object references can be fairly complex and are covered in a later section of this tutorial. See the on-line help topic referencing for complete information.
Stella [Top-Level]: (floor 1 2) 0 1 Stella [Top-Level]:Since Stella is both a Lisp and command interpreter, you must distinguish command names from Lisp variables. To evaluate name, precede it with a comma:
Stella [Top-Level]: ,2pi 6.283185307179586 Stella [Top-Level]:
Stella [Top-Level]: (/ 1 0) Error: An attempt was made to divide by zero. Restart actions (select using :continue): 0: Return to Top-Level. 1: Exit Top-Level. [1] <cl> :tl Stella [Top-Level]:If for some reason you end up in the main Lisp environment after resuming from an error just use the (stella) function to start up Stella again. No work is lost.
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