13 Sep
2016
13 Sep
'16
11:20 a.m.
Sven Mascheck <mascheck(a)in-ulm.de> wrote:
On Mon, Sep 12, 2016 at 02:50:10PM +0200, Joerg
Schilling wrote:
You are missinterpeting things.
The colon in line one as a hint to a modified csh to call the Bourne Shell
first appeared around 1983.
I'm still confused (you're short with context): what does "introduced by
AT&T" mean?
I only know the #-hacked csh from 2BSD+ ('79), and the #-hacked sh from 3BSD+
('80).
How would ":" as a hint in this respect show up on other systems?
This is long ago, so my memory is not good anymore.
Aprox. 30 years ago, I ported my shell to a svr3 system and discovered problems.
AFAIR, this system had special treatment for scripts starting with ":".
Jörg
--
EMail:joerg@schily.net (home) Jörg Schilling D-13353 Berlin
joerg.schilling(a)fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.org/private/ http://sourceforge.net/projects/schilytools/files/
The colon was introduced by AT&T around 1983.
It's a builtin in the v7 Bourne shell - see SYSNULL in msg.c (which
has the command name table) and in xec.c (which has the implementation)