RosettaCodeData/Lang/Teco/00DESCRIPTION
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TECO stands for Text Editor and COrrector. (Originally "Tape Editor and COrrector"). Macro language for text editing, screen handling and keyboard management. Has a reputation for being cryptic and hard to learn. (TECO programs are said to resemble line noise.)
TECO was an early, string-processing language used by the first Emacs. It made maintenance hard, and also made extensions hard to write.
The first EMACS editor was written in TECO.