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interpreter
Causes the user to be interactively prompted for Expect and Tcl commands. The result of each command is printed. 

Actions such as break and continue cause control structures (i.e., for, proc) to behave in the usual way.   However return causes interpreter to return to its caller, while inter_return causes interpreter to cause a return in its caller. 

For example, if “proc foo” called interpreter which then executed the action inter_return, proc foo would return.  Any other command causes interpreter to continue prompting for new  commands. 

By default, the prompt contains two integers.  The first integer describes the depth of the evaluation  stack (i.e., how many times Tcl_Eval has been called).  The second integer is the Tcl history identifier.  The prompt can be set by defining a procedure called “prompt1” whose return value becomes the next prompt.  If a statement has open quotes, parens, braces, or brackets, a secondary prompt (by default “+> “) is issued upon newline.  The secondary prompt may be set by defining a procedure called “prompt2”. 

During interpreter, cooked mode is used, even if the its caller was using raw mode. 


This material is excerpted from the O'Reilly book "Exploring Expect" by Don Libes, and can also be found in the manpage on many UNIX platforms. 

 

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