OS X includes filters from its underlying Unix base but also has Automator, which allows filters (known as "Actions") to be strung together to form a pipeline. filter: 1) In computer programming, a filter is a program or section of code that is designed to examine each input or output request for certain qualifying criteria and then process or forward it accordingly. A filter is "pass-through" code that takes input data, makes some specific decision about it and possible transformation of it, and passes it on to another program in a kind of pipeline. In Windows operating systems, using Microsoft's Internet Server Application Programming Interface ( ISAPI ), you can write a filter (in the form of a dynamic link library or DLL file) that the operating system gives control each time there is a Hypertext Transport Control ( HTTP ) request. Filters may be strung together into a pipeline with the pipe operator ("|"). The most common filter is a software filter that reads data in and manipulates the data to fit another output pattern or removes data that may not be needed. To append data lines to an existing output file, one can use the append operator (>>). Unix filters can also be used by Data scientists to get a quick overview about a file based dataset.[2]. In comparison, however, few filters are built into cmd.exe (the original command-line interface of Windows), most of which have significant enhancements relative to the similar filter commands that were available in MS-DOS. These options are typically found in the left sidebar of the desktop search results page. Video filters can be used to add a specific visual style to a movie, such as black and white film or cinematic color tone. Filters may also be applied to audio and video clips. For example, e-commerce sites like Amazon and Best Buy provide filtering options when you perform a search. While a single filter can be used individually, they are frequently strung together to form a pipeline. The following example gets a list of files in the C:\Windows folder, gets the size of each and sorts the size in ascending order. Filters can be fairly simple effects used to mimic traditional photographic filters (which are pieces of colored glass or gelatine placed over the lens to absorb specific wavelengths of light) or they can be complex programs used to create painterly effects. In Unix and Unix-like operating systems, a filter is a program that gets most of its data from its standard input (the main input stream) and writes its main results to its standard output (the main output stream).

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