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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

A simple program that scans PostScript files for %%DocumentFonts:
comments and prepends requested host resident font files to the
input. Written for Unix 4.0 lp.

Downloaded fonts are the ones named in the %%DocumentFonts: comment
and listed in a special map file (which can be selected using the
-m option). See example.map and comments in download.c for examples
of map files. By default map files and font files are in *hostfontdir.
It's initialized using HOSTDIR (file ../common/path.h).