Filters may operate on one item of a stream at a time or may base an item of output on multiple items of input, such as a moving average.

Examples

The term stream is used in a number of similar ways:
* Stream editing, as with sed, awk, and perl. Stream editing processes a file or files, in-place, without having to load the file(s) into a user interface. One example of such use is to do a search

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