system calls

[igthibau]

Hello one and all,
Hopefully someone can help me out here. I am trying within a C / C++ program
to invoke command line instructions (under linux) i.e.:
say I wish to list the contents of the current dir I would type (in bash
say) : ls (enter).
Now, how do I do to enact this action within a code ?
In fortran the appropriate command is : callsystem "ls", give or take
syntaxic details.
I wish to do the same in C / C++

Any help appreciated, thanks

G.T.

[Dimitris Kamenopoulos]

igthibau wrote:

Hello one and all,
Hopefully someone can help me out here. I am trying within a C / C++
program to invoke command line instructions (under linux) i.e.:
say I wish to list the contents of the current dir I would type (in bash
say) : ls (enter).
Now, how do I do to enact this action within a code ?
In fortran the appropriate command is : callsystem "ls", give or take
syntaxic details.
I wish to do the same in C / C++

Invoking "ls" is not a system call[*], it is just executing an external
("system") command. You can do it with system() in <cstdlib>.
system("ls") will execute ls and return ls' exit code. See also the man page
of system (man 3 system) and it might be a good idea to check for more
advanced stuff in a linux (or unix) specific forum.
[*] system calls under Unix-like OSes are all those strange functions
documented in man(2).

[Russell Hanneken]

igthibau wrote:

Hopefully someone can help me out here. I am trying within a C / C++
program to invoke command line instructions (under linux) i.e.:
say I wish to list the contents of the current dir I would type (in bash
say) : ls (enter).
Now, how do I do to enact this action within a code ?

#include <cstdlib> // needed for std::system
#include <iostream>
#include <ostream>

int main()
{
if (std::system(0))
{
// A command processor is available.
std::system("ls");
}
else
{
std::cerr << "A command processor is not available.\n";
}
}

--
Russell Hanneken
rg********@pobox.com
Remove the 'g' from my address to send me mail.

[Mike Wahler]

"igthibau" <ig******@wanadoo.fr> wrote in message
news:bl**********@news-reader1.wanadoo.fr...

Hello one and all,
Hopefully someone can help me out here. I am trying within a C / C++ program to invoke command line instructions (under linux) i.e.:
say I wish to list the contents of the current dir I would type (in bash
say) : ls (enter).
Now, how do I do to enact this action within a code ?
In fortran the appropriate command is : callsystem "ls", give or take
syntaxic details.
I wish to do the same in C / C++

#include <cstdio>
int main()
{
std::system("ls");
return 0;
}

-Mike