Passing values to Program during runtime invoked through shell script

[das.diptendu]

How to give inputs to a program through shell script during runtime if the program asks for user input while it is being executing?

A program is being invoked by the help of shell script. This program asks the username and password for authentication process.
How can I give the same using shell script so that it can be automated one.

Below is my Shell Script:


#!/bin/bash
#
# Script to Authentiacate a user
#

# The program Authenticate takes the IP Address to connect.
# After successful connection it asks for username and password
# to authenticate user.

Authenticate 192.1.2.65

# How can I pass the same if username is "guest" and
# password is "guest".

[robinsonvpanicker]

from the shell script u can pass command line arguments like u pass from the command prompt
eg;; in ur script pass it like this
./test guest guest
if u have stored this username and passwd in a variable like user and passwd
pass to the prgm like this
./test $user $passwd
and in the pgm collect it through argv[] and argc....hope this helps

[das.diptendu]

Thanx for your reply.

Perhaps you have mistaken my prob.
My problem is to pass values to a program which is already running, which can't be passed as command line arguments.
I am using the IP address as a command line argument to the program "Authenticate".

BUt at Runtime it asks the value of a particular field like the username and then the password for the validation.
How these can be handled in shell script?

Thanking U in Advance.

[robinsonvpanicker]

then if thats the case i think u should use environment variables....this can help u at runtime for sure...y not try that........

[i92guboj]

You can try feeding them by redirecting stdin to a file, or directly like this:

$ cat << EOF
> one
> two
> three
> the next line will exit
> EOF
one
two
three
the next line will exit
$

You get the idea... You can do the same in a script. The input should be sent to the program until it reaches the EOF mark.