#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main (int argc, char *argv[])
{

    if ( argc!=2 )
    {
        fprintf(stderr,"Usage : script <tailleBuffer>");
        exit(1);
    }

    int tailleBuf = atoi(argv[1]);
    int c;

    unsigned char* buffer = ( unsigned char* ) malloc(tailleBuf*sizeof( unsigned char ));

    while((c = read(0,buffer,tailleBuf)) > 0)
    {
        write(1,buffer,c);
    }
    free(buffer);
    return 0;
}