从文本文件中读取输入，Bash 脚本

Question

I am new to writing scripts in Bash and I am working on an assignment to make an inventory system. I have written all the scripts and they all work from using the standard input terminal. I now am looking to take the inputs from a text file called a1Input.txt which has all inputs on a new line.

r
9823
r
5430
c
7777
sml_widget
Small Widget (1 oz.)
6.99
15
50
Small, white, widget w/o packaging
r
7777
d
9823
r
9823
r
3293
u
3293


29.99
33
75


r
3293

The code for my initial bash script is this

#!/bin/bash

# assign1.bash

shopt -s nocasematch

option=""
until [ "$option" = "F" ]; do
echo "C - create a new item"
echo "R - read an existing item"
echo "U - update an existing item"
echo "D - delete an existing item"
echo "T - total price of an item"
echo "Choose a option"
read option
case $option in
C)
./create.bash
;;R)
./read.bash
;;U)
./update.bash
;;D)
./delete.bash
;;T)
./total.bash
;;*) 
echo "Invalid input"



esac
done

Answer 1

What i would do to inject inputs from file to an interactive script is just:

cat a1Input.txt | ./interactive_script.sh

For example, imagine this simple script (copy-paste on terminal to create):

cat << EOF > questions.sh
#!/bin/bash
echo "What's your name ?"
read name
echo "What is your favourite movie ?"
read movie
echo "Hi \$name, i also love '\$movie' movie !!"
EOF

And these inputs:

cat << EOF > inputs.txt
Edu
Interstellar
EOF

Then, just execute:

chmod a+x questions.sh
cat inputs.txt | ./questions.sh

If your script is more complicated, consider using "expect", although this is quite complex.

BRs