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It is not necessary to use the graphical interface of NDL.
Instead, one can invoke NDL in so-called ``batch mode.'' If file foo contains a NDL
script (see section 1.3), then typing Ndl foo at the
OS shell prompt (a Unix terminal or a DOS window) will load the file foo,
process the various NDL phrases in it sequentially, and display the results
to the ``standard output device'' (usually the screen). The user can choose
to redirect the output to a file instead of the screen by specifying a
second file name as the last command-line argument to NDL, as in
Ndl foo.in foo.out. Note that any previous contents of foo.out
will be lost.
2004-08-04