From: Warren Toomey <wkt(a)tuhs.org>
But wasn't "chdir" built into the PDP-7
Unix shell?
No. See "The Evolution of the Unix Time-sharing System", in section
"Process
control".
Also, the old 'cd' had different syntax than today's (since there was no
notion
of a pathname in the earliest Unix); it took instead a list of directories (e.g.
"cd dd ken").
Noel