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First appearing in Version 4 Unix, grep was created by Ken Thompson as a standalone application adapted from the regular expression parser he had written for ed (which he also created). In ed, the command g/re/p would print all lines matching a previously defined pattern.
Most descriptions of the MVP pattern describe how the model can notify the view or the presenter if something changes in the model. This behavior is usually relevant for rich-client applications so it is omitted here. In rich clients, the model is often kept in memory.