On Fri, 4 Apr 2014, Chow Loong Jin wrote:
> Are you sure about this?
Yes.
> Some references would be helpful. I can't seem to find anything on this
> through
Sure. I’ve patched mksh to use “#?” ipv “#!” as shebang, to
simulate a kernel not supporting the shebang:
Index: exec.c
===================================================================
RCS file: /cvs/src/bin/mksh/exec.c,v
retrieving revision 1.129
diff -u -p -u -p -r1.129 exec.c
--- exec.c 11 Jan 2014 16:26:27 -0000 1.129
+++ exec.c 4 Apr 2014 09:34:58 -0000
@@ -893,7 +893,7 @@ scriptexec(struct op *tp, const char **a
/* restore begin of shebang position (buf+0 or buf+3) */
cp = (unsigned char *)(buf + fd);
/* bail out if read error (above) or no shebang */
- if ((cp[0] != '#') || (cp[1] != '!'))
+ if ((cp[0] != '#') || (cp[1] != '?'))
goto noshebang;
cp += 2;
(Some comment on the side: “buf+0 or buf+3” is because mksh additionally
strips an UTF-8 BOM before the shebang. This is beyond standard.)
Then I run this:
tglase@tglase:~ $ cat x
#?/usr/bin/python
import sys
print sys.version
tglase@tglase:~ $ ls -l x
-rwxr-xr-x 1 tglase tglase 47 Apr 4 12:54 x
tglase@tglase:~ $ ./x
import.im6: unable to grab mouse ': Resource temporarily unavailable @
error/xwindow.c/XSelectWindow/9047.
sys.version
tglase@tglase:~ $ b/mksh
tglase@tglase:~ $ ./x
2.7.6 (default, Mar 22 2014, 17:40:27)
[GCC 4.8.2]
(This is Debian sid/i386 (still waiting for x32, that’s why i386).)
> some cursory googling.
Try duckduckgoïng instead ☻ or searching POSIX, or something.
Also, “man mksh” look for EXECSHELL (which is the interpreter the
shell uses if the script doesn’t even have a shebang).
bye,
//mirabilos
--
Sometimes they [people] care too much: pretty printers [and syntax highligh-
ting, d.A.] mechanically produce pretty output that accentuates irrelevant
detail in the program, which is as sensible as putting all the prepositions
in English text in bold font. -- Rob Pike in "Notes on Programming in C"
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