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Subject: Re: [TUHS] Origins of shell prompt suffixes % $ > #
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> I was told, but cannot recall by whom, that the csh decision to use % =
when the bourne shell had $ was to make it clear which syntax was =
expected by the user. tcsh inherited from csh. Bash/Zsh/Ash/Ksh =
inherited from sh.

I don't buy it.   CSH predates the Bourne shell by a year.   I suspect =
it used % because the V6 shell it replaced used %.