Answer prompts in bash - bash

Question

I am often in the need of running a bash script that needs inputs from me and im trying to improve my workflow by automating this.
In my case my bash script is in need of 3 inputs from me:
What interface should i use?
1
Enter the password:
mypass
Please restart the program:
sudo bash restart
How can i make my bash script file auto input theses values? I have tried figuring this out but all the answer are about inputing yes or no.

Answer 1

If that is all the input your program needs, then you can simply put the inputs, one per line, in a text file, then run it like this:
$> ./yourscript.sh < yourtextfile.txt
For your example, the text file would contain
1
mypass
sudo bash restart

Answer 2

If you have such a script.sh:
#!/bin/bash
read -p "What intergace should i use?"$'\n' interfacenum
echo
read -p "Enter the password:"$'\n' pass
echo
read -p "Please restaart the program:"$'\n' prog
echo
echo "Values:"
for i in interfacenum pass prog; do
echo $'\t'"$i=\"${!i}\""
done
You can 'input' the values into the script using echo or printf:
echo -ne "1\nmypass\nsudo bash restart\n" | ./script.sh

Answer 3

You can use expect and autoexpect to achieve your task.
Let's say this is your file:
cat hello.sh
#!/usr/local/bin/bash
read -p "Select the interface: " interface
echo "interface selected: $interface"
read -p "Enter the username: " username
echo "username: $username"
You don't have to even write the scripts. You can you autoexpect to generate the script for you.
autoexpect ./hello.sh
autoexpect started, file is script.exp
Select the interface: 1
interface selected: 1
...(more input and output to generate the script)
Examine the generated script.
tail -n7 script.exp
expect -exact "Select the interface: "
send -- "1\r"
expect -exact "1\r
interface selected: 1\r
Enter the username: "
send -- "vivek\r"
expect eof
Now sit back and run the generated script
./script.exp
spawn ./hello.sh
Select the interface: 1
interface selected: 1
Enter the username: vivek
username: vivek