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dpsexec is a Display PostScript program that allows the user to interact directly with the PostScript interpreter through a command interface. dpsexec reads lines of text from standard input and passes each line to the PostScript interpreter for execution. It creates a window that displays the results of graphics operations as they are executed. dpsexec exits when end of file is reached on standard input, or when the user types "quit<return>", which executes the PostScript quit operator.
By default, dpsexec executes the PostScript executive operator before it accepts any user input. This operator puts the PostScript interpreter in "interactive executive" mode so that the user can control the interpreter directly. In this mode, the PostScript interpreter supports certain line-editing functions and prompts the user when it is ready to execute more input. See section 2.4.4, "Using the Interpreter Interactively," of the PostScript Language Reference Manual, Second Edition, for detailed information on this mode of operation.
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