how to call system command with variable parameters?

[shaggystyle]

I'm looking for a way to call system commands with variable parameters
within a Unix environment. Sort of like system() but i need to be
able to pass variable parameters....s o I guess it would kind of look
like this:

system("command -%s -%s", parameter1, parameter2);

I've tried the above and it doesn't work when compiled with GCC.
Thanks.

[lallous]

Re: how to call system command with variable parameters?

"shaggystyl e" <shaggystyle@ho tmail.com> wrote in message
news:6d0c4c3b.0 402180805.1ae30 ec4@posting.goo gle.com...[color=blue]
> I'm looking for a way to call system commands with variable parameters
> within a Unix environment. Sort of like system() but i need to be
> able to pass variable parameters....s o I guess it would kind of look
> like this:
>
> system("command -%s -%s", parameter1, parameter2);
>
> I've tried the above and it doesn't work when compiled with GCC.
> Thanks.[/color]

Hello

Use sprintf()

char temp[512];
sprintf(temp, "command -%s -%s", parameter1, parameter2);
system((char *)temp);

However this was not a C++ question.
--
Elias

[David Harmon]

Re: how to call system command with variable parameters?

On Wed, 18 Feb 2004 18:05:32 +0200 in comp.lang.c++, "lallous"
<lallous@lgwm.o rg> was alleged to have written:[color=blue]
>Use sprintf()
>
>char temp[512];
>sprintf(temp , "command -%s -%s", parameter1, parameter2);
>system((char *)temp);
>
>However this was not a C++ question.[/color]

std::ostringstr eam cmd;
cmd << "command -" << parameter1 << " -" << parameter2;
system(cmd.str( ).c_str());

There, now it was a C++ question. :-)

[Clark Cox]

Re: how to call system command with variable parameters?

In article <c102rb$1c777a$ 1@ID-161723.news.uni-berlin.de>,
"lallous" <lallous@lgwm.o rg> wrote:
[color=blue]
> "shaggystyl e" <shaggystyle@ho tmail.com> wrote in message
> news:6d0c4c3b.0 402180805.1ae30 ec4@posting.goo gle.com...[color=green]
> > I'm looking for a way to call system commands with variable parameters
> > within a Unix environment. Sort of like system() but i need to be
> > able to pass variable parameters....s o I guess it would kind of look
> > like this:
> >
> > system("command -%s -%s", parameter1, parameter2);
> >
> > I've tried the above and it doesn't work when compiled with GCC.
> > Thanks.[/color]
>
> Hello
>
> Use sprintf()
>
> char temp[512];[/color]

What if the command plus it's parameters is longer than 511 characters?
Use ostringstream instead.
[color=blue]
> sprintf(temp, "command -%s -%s", parameter1, parameter2);
> system((char *)temp);[/color]
This cast is completely redundant.

[lallous]

Re: how to call system command with variable parameters?

David Harmon <source@netcom. com> wrote in message news:<409991bf. 239285043@news. west.earthlink. net>...[color=blue]
> On Wed, 18 Feb 2004 18:05:32 +0200 in comp.lang.c++, "lallous"
> <lallous@lgwm.o rg> was alleged to have written:[color=green]
> >Use sprintf()
> >
> >char temp[512];
> >sprintf(temp , "command -%s -%s", parameter1, parameter2);
> >system((char *)temp);
> >
> >However this was not a C++ question.[/color]
>
> std::ostringstr eam cmd;
> cmd << "command -" << parameter1 << " -" << parameter2;
> system(cmd.str( ).c_str());
>
> There, now it was a C++ question. :-)[/color]

Thanks for the tip!

--
Elias