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TECO is a text editor made at Massachusetts Institute of Technology (MIT) in the mid-1960s. It was designed to be extremely powerful and flexible, letting users create custom macros and scripts to manipulate text. Written as macros that extend the editor's capabilities, these scripting features make TECO both a text editing tool and a high-level programming language. Although difficult for some users due to its terse command structure and lack of interactive help, TECO was influential in the development of later editors like Emacs.

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