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这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

Programs for building troff width tables on a PostScript printer.
Assumes you have direct access to the printer's serial port. Also
needs a special table dependent shell library file to build the
tables (e.g. ../devLatin1/shell.lib).