C++ program to merge 2 files using command line arguments.

The following program accept 4 command line arguments. First argument ( argv[0] ) is assumed as program name. second and third arguments are file names to be merged. Last argument is the output file, to which the merged contents saved.

#include <fstream>
#include <iostream>
#include <stdlib.h>
using namespace std;
#include <process.h>
int main(int argc, char* argv[] )
{

    char ch;
    ifstream infile;
    infile.open( argv[1] );
    if( !infile )
    {
        cerr << "\nCan't open " << argv[1];
        exit(-1);
    }
    ofstream outfile;
    outfile.open( argv[3] );
    if( !outfile )
    {
        cerr << "\nCan't open " << argv[3];
        exit(-1);
    }
    while( infile )
    {
        infile.get(ch);
        outfile.put(ch);
    }
    infile.close();

    infile.open( argv[2] );
    if( !infile )
    {
        cerr << "\nCan't open " << argv[2];
        exit(-1);
    }

    while( infile )
    {
        infile.get(ch);
        outfile.put(ch);
    }
    infile.close();
    outfile.close();
    return 0;
}

Hope that this is useful for you

according to your question this will help you

C:\>type text1.txt
this is a test.
then you can use the type command plus the double arrows to merge a files

C:\>type *.txt >>merge.txt
text1.text
text2.text etc...

and note if you using linux you can use :

cat *.txt >> merge.txt (>> ==means input streams)