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By convention, all the programs accept only one non-option argument, which they take to be the name of the main input file.
Usually this is the name of a bitmap font. By their nature, bitmap fonts are for a particular resolution. You can specify the resolution in two ways: with the `-dpi' option (see the next section), or by giving an extension to the font name on the command line.
For example, you could specify the font
foo at a resolution of
300dpi to the program program in either of these two ways
(`$ ' being the shell prompt):
$ program foo.300 $ program -dpi=300 foo
You can also say, e.g., `program foo.300gf', but the `gf' is ignored. These programs always look for a given font in PK format before looking for it in GF format, under the assumption that if both fonts exist, and have the same stem, they are the same.
If the filename is absolute or explicitly relative, i.e., starts with `/' or `./' or `../', then the programs do not use search paths to look for it, as described in 3.4 Font searching. Instead, the fonts are simply searched for in the given directory.