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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 1.5), 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.
2004-08-06