[TUHS] History of #! interpretation in Unix

[Cyrille Lefevre]

Le 19/01/2011 21:35, Sven Mascheck a écrit :
>
> Cyrille Lefevre wrote:
>
>> yet another reference but more in the spirit of what csh does, it only
>> checks for a simple hash (#), no explaim mark (!), and is enclosed in
>> UCB_SCRIPT define.
>>
>> http://minnie.tuhs.org/cgi-bin/utree.pl?file=2.9BSD/usr/src/sys/sys/sys1.c
>
> Perhaps you missed the ! in the macro?

right %-/

> #define SCRMAG '#!'

multi-character character constant !

u.u_exdata.ux_mag == SCRMAG makes me wonder...

$ cat x.c
#include <stdio.h>
main() { int c = '#!'; printf("%x", c); return 0; }
$ make x
cc     x.c   -o x
x.c:2:18: warning: multi-character character constant
$ ./x
2321
$ man ascii
...
| 20 sp | 21  ! | 22  " | 23  # | 24  $ | 25  % | 26  & | 27  ' |
...

well, it works !


Regards,

Cyrille Lefevre
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