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Chapter5 L_O_V_E FORTH
5.0 Using DOS Commands in LOVE Forth
--------------------------------
L.O.V.E. Forth can invoke the MSDOS command interpreter to perform
tasks such as deleting files, copying files or displaying the contents of a
directory, with a simple and flexible DOS command. The DOS command is a
Forth word in the TOOLBOX vocabulary.
To use the DOS command interactively just type:
DOS
followed by the MSDOS command that is desired and press the
<return> key.
Example:
DOS dir/w <cr>
will display the contents of the current directory and then
return to Forth.
DOS commands can be embedded in source code screens or in text
files with the restriction that there be no other Forth words on that line
after the actual MSDOS command appears. The reason for this is that
L.O.V.E. Forth passes all the information after the word DOS up to the
carriage return character, if interpreting from the keyboard or a text
file, or up to the end of a screen line, if interpreting from a block. Any
Forth words on the rest of that line will confuse the MSDOS command
interpreter.
If a programmer desires to remain in the shell of the command
interpreter for an extended period, the DOS command can be used to invoke a
new shell by stating:
DOS <cr>
The MSDOS prompt will appear on the display. To return to Forth
the word "exit" must be typed to exit from the shell.