TECO, aka Text editor character oriented, is a programming language created in 1963.
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TECO (; originally an acronym for [paper] Tape editor and corrector, but later Text editor and corrector, then Text editor character oriented) is a text editor originally developed at the Massachusetts Institute of Technology (MIT) in the 1960s, after which it was modified by many other people. TECO was a direct ancestor of Emacs, which was originally implemented in TECO macros.. Read more on Wikipedia...
IHello, world! $HT$$
!Hello World in TECO !The $ symbol below wouldn't actually be a printing character - !it's the [escape] character, \u001b! FTHello World$
0uz ! clear repeat flag ! <j 0aua l ! load 1st char into register A ! <0aub ! load 1st char of next line into B ! qa-qb"g xa k -l ga -1uz ' ! if A>B, switch lines and set flag ! qbua ! load B into A ! l .-z;> ! loop back if another line in buffer ! qz;> ! repeat if a switch was made last pass !