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From: Doug McIlroy <doug@cs.dartmouth.edu>
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Subject: Re: [TUHS] Origins of shell prompt suffixes % $ > #
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> The Bourne shell (V7) had setable PS1 (start of command) and PS2 (continuation prompts)

When PS2 came on the scene, Bob Morris noticed that it most often appeared
because of a missing close quote. Therefore he set PS2="hit interrupt".