#include< stdio.h>
main (int argc, char *argv[])
{
        FILE *fp;
        if (argc!= 2)
                printf ("Please Enter a FileName\n");
        else
        {
                fp = fopen (argv[1], "r");
                printf ("File Found\n");   
                fclose (fp);
        }
        return 0;
}                                                  

##</code><code>##


#!/usr/bin/perl

./a.out input.txt > output.txt   ###How should I do this?

$output_file="output.txt";
open(OP, $output_file) || die("Could not open file!");
@sequence=<OP>;     # tosses the contents of "output.txt" in an array "@sequence" to work on.