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## 2.5 Filter Mode Interface

From the point of view of the application developer or compiler writer, there are parameter mode applications, which are discussed in Parameter Mode Interface, and filter mode applications, which are discussed in this section. Of the latter, there are mainly three kinds: those that read one character at a time, those that read a line at a time, and those that read the whole standard input file at once. Each of them is invoked with different options and expected to follow different calling conventions. This section summarizes these conventions.

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