how to send a pw to a programm?!

stefanero · 04-19-2004, 10:52 AM

hello

I am new to programming and I just want to write a little programm which sends a password to another programm

I don't really care if perl or C

but let me explain a little better...

First I want to start in the script A, Programm B. Then Programm B will wait for a Passwort to be inserted.
At that point I would want the script A to contiue and send the pw. so that the programm B contious loading

any clues how to do that?!

thnx very much
stefanero

itsme86 · 04-19-2004, 11:43 AM

man popen.

Mohsen · 04-19-2004, 12:09 PM

A sample from Wrox Linux Programming (Chapter 11):

Code:

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

int main()
{
    FILE *read_fp;
    char buffer[BUFSIZ + 1];
    int chars_read;

    memset(buffer, '\0', sizeof(buffer));
    read_fp = popen("uname -a", "r");
    if (read_fp != NULL) {
        chars_read = fread(buffer, sizeof(char), BUFSIZ, read_fp);
        if (chars_read > 0) {
            printf("Output was:-\n%s\n", buffer);
        }
        pclose(read_fp);
        exit(EXIT_SUCCESS);        
    }
    exit(EXIT_FAILURE);
}

and another one:

Code:

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

int main()
{
    FILE *write_fp;
    char buffer[BUFSIZ + 1];

    sprintf(buffer, "Once apon a time, there was...\n");
    write_fp = popen("od -c", "w");
    if (write_fp != NULL) {
        fwrite(buffer, sizeof(char), strlen(buffer), write_fp);
        fclose(write_fp);
        exit(EXIT_SUCCESS);        
    }
    exit(EXIT_FAILURE);
}

stefanero · 04-19-2004, 02:25 PM

hey

thnx very much

stefanero