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How far back does Linux's backwards compatibility extend?
puk
Posted 2011-10-21T19:18:06.197
Reputation: 607
What's the oldest supported program for Linux?
Answers
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According to this, dc is older than the C programming language.
This article indicates that roff, which evolved into troff dates back to about 1970 -- but it says it was added to Unix, implying that other programs already existed. It mentions the text editor, probably ed.
One could argue that /bin/true is a reimplementation of IEFBR from IBM's OS/360.
Keith Thompson
Posted 2011-10-21T19:18:06.197
Reputation: 4 645
Are you asking about source (API) compatibility or binary (ABI) compatibility?
– bwDraco – 2011-10-21T19:47:58.4071Hello World. -- – Hello71 – 2011-10-21T21:16:33.880