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....so 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]

"shaggystyle" <sh*********@hotmail.com> wrote in message
news:6d**************************@posting.google.c om...

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....so 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.

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]

On Wed, 18 Feb 2004 18:05:32 +0200 in comp.lang.c++, "lallous"
<la*****@lgwm.org> was alleged to have written:

Use sprintf()

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

However this was not a C++ question.

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

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

[Clark Cox]

In article <c1*************@ID-161723.news.uni-berlin.de>,
"lallous" <la*****@lgwm.org> wrote:

"shaggystyle" <sh*********@hotmail.com> wrote in message
news:6d**************************@posting.google.c om...

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....so 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.
Hello

Use sprintf()

char temp[512];

What if the command plus it's parameters is longer than 511 characters?
Use ostringstream instead.
sprintf(temp, "command -%s -%s", parameter1, parameter2);
system((char *)temp);

This cast is completely redundant.

[lallous]

David Harmon <so****@netcom.com> wrote in message news:<40****************@news.west.earthlink.net>. ..

On Wed, 18 Feb 2004 18:05:32 +0200 in comp.lang.c++, "lallous"
<la*****@lgwm.org> was alleged to have written:

Use sprintf()

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

However this was not a C++ question.

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

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

Thanks for the tip!

--
Elias