I need help about "cat"

[catanian]

I asked by someone to change linux's program "cat"

to change result of "cat A B" to be "cat B A"

http://pastebin.com/VtmXueEq

Can anyone fixed this and pastebin back to me

Best Regards,

[kbw]

First, cat is a system utility. Make a new program, call it meow or something dog is already taken.

Why post the code somewhere else?

You just process the args right to left.

[catanian]

My friend give the challenge on edit the source code to complete task, I gonna "./configure && make" without "make install" to not replace with my original cat


full source code here http://ftp.gnu.org/gnu/coreutils/coreutils-8.19.tar.xz

Bad news...I don't know anything about C++, I'm PHP Programmer T__T

[MiiNiPaa]

#include <cstdlib>
#include <string>

int main(int argc, char* argv[])
{
     if (!(argc < 3)) {
        std::string command = "cat ";
        command = command + argv[2]+ " " + argv[1];
        std::system(command.c_str());
    }
}

Works on Linux systems. Probably.

[catanian]

Thanks you so much! but which libraries I have to include?

$ g++ catseen.c
catseen.c: In function ‘int main(int, char**)’:
catseen.c:8:9: error: ‘ctring’ is not a member of ‘std’
catseen.c:8:21: error: expected ‘;’ before ‘command’
catseen.c:9:9: error: ‘command’ was not declared in this scope
catseen.c:10:31: error: ‘system’ was not declared in this scope
catseen.c:11:1: error: expected ‘}’ at end of input

[MiiNiPaa]

It won't actually do anything. It just calls program "cat" with first two parameters swapped.
I updated my post.

[catanian]

May you forgot one '}' and it's work!! Thanks you again