12 Sep
2016
12 Sep
'16
4:13 a.m.
On Sun, Sep 11, 2016, at 14:50, Sven Mascheck wrote:
I tried to follow all the traces of #! and collected
the results on
http://www.in-ulm.de/~mascheck/various/shebang/
I'd be happy to add and fix stuff, if somebody spots anything.
DEMOS (the soviet version of Unix) seems to have an independent
implementation that supports some features no-one else does
- use $* to define where the passed-in arguments [including the script
name] go between the interpreter-arguments specified on the #!-line
- alternate magic "/*#!"
I don't remember where I downloaded it from, I think maybe someone
posted it here a few years ago.
Relevant bits from sys1.c:
# define SCRMAG "#!"
# define SCRMAG2 "/*#!"
# define ARGPLACE "$*"
/* формат:
пусть есть файл /.../.../x
со следующим содержимым:
-------------------------------
|#!CMD A1 A2 A3
| .......
Вызываем команду:
x B1 B2
Запустится на самом деле такая команда:
CMD A1 A2 A3 /.../.../x B1 B2
Один из аргументов Ai может иметь вид $*
Тогда аргументы запуска подставятся на это место, а не в конец:
-------------------------------
|#!CMD A1 $* A2 A3
| .......
Вызываем:
x B1 B2
Запустится:
CMD A1 /.../.../x B1 B2 A2 A3
*/
There's no comment describing the SCRMAG2 feature but you can see it
used in code:
if (indir < NSYMLNK && u.u_offset > (off_t)2 ){
cp = (char *) &u.u_exdata;
if( !bcmp(cp, SCRMAG, 2 ))
off = (off_t) 2;
else if( u.u_offset > (off_t)4 && !bcmp( cp, SCRMAG2, 4))
off = (off_t) 4;
Sole uses of these features in the source tree:
cmd/OPQRS/spline.c,v:@/*#!/bin/cc -O $* -o spline
cmd/EFGHIJK/glob.c,v:@/*#!/bin/cc -o glob