The SuDoku command line app presents the graphical interface familiar from the applet.
SuDoku [-a boxesAcross] [-d boxesDown] [-i]
The [-a boxesAcross] and [-d boxesDown] options allow
the app to be started with a non-standard grid size. (Of course, it is possible
to change the grid size from within the app once it has started.) The default
values are three.
The -i option stipulates that an initial grid should be read from
standard input. (In this case, the -a and -d options
will be ignored.) The initial grid should be entered in the format used by the
app's Copy button.
SuDoku starts an app that displays an empty 3x3 grid.
SuDoku -a 4 -d 4 starts an app that displays an empty 4x4 grid.
SuDoku < puzzle.txt starts an app that displays the puzzle stored
in the file puzzle.txt.