14 Jul
2016
14 Jul
'16
8:11 p.m.
On Thu, 14 Jul 2016 16:18:43 +0300, Diomidis Spinellis wrote
I remember hearing that originally the Unix shell had
control structures
(e.g. if, while, case) implemented through external commands. However,
I can't see this reflected in the source code. The 7th Edition
Bourne shell has these commands built-in (usr/src/cmd/sh/cmd.c), while
the 6th Edition (usr/source/s2/sh.c) seems to lack them completely.
http://www.tuhs.org/cgi-bin/utree.pl?file=V6/usr/source/s1/if.c
http://www.tuhs.org/cgi-bin/utree.pl?file=V6/usr/source/s1/goto.c
--
Kevin Schoedel <schoedel(a)kw.igs.net> VA3TCS