Here is what I get from 'man execl':
int execl( const char *path, const char *arg, ...);
The const char *arg and subsequent ellipses in the execl,
execlp, and execle functions can be thought of as arg0,
arg1, ..., argn. Together they describe a list of one or
more pointers to null-terminated strings that represent
the argument list available to the executed program. The
first argument, by convention, should point to the file
name associated with the file being executed. The list of
arguments must be terminated by a NULL pointer.
It looks to me like the second example you give matches the man page,
while the first example is trying to use /bin/sh as the first argument
to the shell /bin/sh, which is wrong.
"Mike A. Harris" wrote:
>
> For the life of me I can't get a shellscript to run from
> execl() properly. It is incredibly odd.
>
> The script "test.sh" is an ordinary shell script with permissions
> set to 755 owned by root:root in /usr/local/bin and is in the
> path for everyone.
>
> Inside an app I'm working on, I do a fork(), and then try to
> execl() the shellscript with:
>
> execl("/bin/sh", "/bin/sh", "-c", "test.sh", NULL);
>
> The above fails all the time period.
>
> If I'm logged in as "mharris", and I do:
>
> execl("/bin/sh", "-c", "test.sh", NULL);
>
> It works, despite the documentation for execl saying the first
> two passed args should be the same. If I log in as
> "testuser" however, and run the program it does not
> work. Doesn't matter which of the above execl()'s I use.
>
> I haven't used exec family of functions in programming much other
> than to fire off an executable here and there. This is my first
> time wanting to fire off a shell script. I've followed the
> manpage and GNU info documentation for exec family of functions
> and all to no avail.
>
> Could someone please send me code which is guaranteed to execute
> ANY shell script regardless of what it is written in? Or any
> other pointers would be appreciated as well.
>
> Thanks.
> TTYL
>
> --
> Mike A. Harris Linux advocate
> Computer Consultant GNU advocate
> Capslock Consulting Open Source advocate
>
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