[Gambas-user] Doubts in execute shell commands

[Fabien Bodard]

Le Friday 09 November 2007 19:53:28 Benoit Minisini, vous avez écrit :
> On vendredi 9 novembre 2007, ron wrote:
> > On Friday 09 November 2007 09:26, Tomas Eroles i Forner wrote:
> > > Hi!
> > > Thanks for your help Ron.
> > > It seems that GAMBAS does not like &.
> > > The only way I've seen is using SHELL instead of EXEC, but it does not
> > > works anyway, that is, I can see the graph, but only one or two
> > > seconds.
> > >
> > > Anybody could explain the difference?
> >
> > oops
> >
> > maybe the 3' parm must be "\&" for escaping the ampersand.
> > Does it also not work with SHELL ( "gnuplot graph1.plt \&" ) ??
> >
> > Ron
>
> Hmmm. A lot of confusion there...
>
> SHELL run commands inside a "shell" (/bin/sh), i.e. it takes the string and
> sends it directly to a shell.
>
> EXEC run a process with arguments (this is the reason why it is run with a
> string array).
>
> The "&" is a shell thing, not a O.S. thing. As "|" (pipes), "<"/">"
> (redirections) and all syntax you could find by typing "man bash". So when
> you pass shell syntax to the EXEC command, they are sent directly to the
> executed process without being interpreted.
>
> So, "man system", "man bash" and "man execve" to understand the
> differences. :-)
>
> Now running a program from Gambas is different from running a program from
> a X11 console. The X11 console runs its processes inside a "virtual
> terminal". Gambas runs its processes through pipes.
>
> Gambas can do the same thing, but not by default. You must use a special
> syntax as explained on the wiki man pages: EXEC [...] FOR INPUT OUTPUT.
>
> Note: a real terminal is the console you get when you type ALT-F1 ->
> ALT-F6.
>
> Command-line processes usually checks its standard input, and behave
> differently when they are run inside a terminal and when they aren't.
>
> For more information, "man isatty", "man pipe", "man getpt", "man grantpt",
> and the gbx_c_process.c source file of the Gambas interpreter. :-)
>
> Regards,

Hey Benoit... is it say at same in the wiki doc ?... if not  can you put it