spell - 1.1-2+b1 main

GNU Spell is a spelling checking program which prints each misspelled word
on a line of its own. It is designed as a clone of the standard Unix `spell'
program, and implemented as a wrapper for Ispell.
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Spell accepts as its arguments a list of files to read from. Within that
list, the magical file name `-' causes Spell to read from standard input.
In addition, when called with no file name arguments, Spell assumes that
it should process standard input.