On Wed, Mar 23, 2016 at 6:06 PM, Noel Chiappa <jnc@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