On Wed, Mar 23, 2016 at 6:06 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:

>
>
> It was in V6, and probably before that; it's truly ancient.



​Yep - you see vestiges in ​
v0 - Dennis used an rc file call the parts of the B compiler.    In V1's
man page, it's listed as a bug that
​ calling the B compiler via that script
should probably be a command.
​  Having exec call the shell if the file is executable and not a 4xx magic
number has not yet appeared, but its not that far off.

Clem​
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