BASH SELECT CASE using list from a file as variables - bash

Question

name01=$(echo "Data 01")
name02=$(echo "Data 02")
echo "Please select data : "
PS3="Answer : "
optionname=(
"$name01"
"$name02"
"$name99")
select opt1 in "${optionname[#]}"
do
case $opt1 in
$name01) echo "$name01" ; break ;;
$name02) echo "$name02" ; break ;;
$name99) echo "Please enter the data : " ; read "name99" ; break ;;
*) echo invalid option;;
esac
done
This is part of my current script, and only have 12 data for now, but the amount and name of the data will change over time, so I need the data/variable (name01, name02, name03, ...) imported from a list from a separate text file. Let say the file look like this inside :
aa bb
aaaa ccc
ab cdd
Need advice,
Thanks in advance

Answer 1

If you just want to validate user input against a list of options in a file, then you could simply use grep:
Given a list of options in options.txt.
banana
apple
pear
And a script (option.bash):
#!/bin/bash
read -p 'Please enter your favourite fruit: ' fruit_input
if grep -q -o -x -- "$fruit_input" options.txt; then
echo "Your favourite fruit is: $fruit_input"
else
echo "The only fruits you're allowed to choose are:"
cat options.txt
fi
You can use grep to validate that the user entered an allowed option:
./option.bash
Please enter your favourite fruit: apple
Your favourite fruit is: apple
./option.bash
Please enter your favourite fruit: cheese
The only fruits you're allowed to choose are:
banana
apple
pear

Answer 2

Here is the update for my script, list is on /tmp/name_list
touch /tmp/number_list
touch /tmp/number_name_list
amount=$(cat /tmp/name_list | wc -l)
a=0
while [[ $a -lt $amount ]]; do
let a=$a+1
echo $a >> /tmp/number_list
name=$(sed -n "${a}p" /tmp/name_list)
echo "$a $name">> /tmp/number_name_list
done
cat /tmp/number_name_list
read -p "Please enter the number or enter new name : " input
if
grep -q -o -x -- "$input" /tmp/number_list
then
folder=$(sed -n "${input}p" /tmp/name_list)
echo "its $folder"
mkdir /tmp/"$folder"
else
echo "its $input"
mkdir /tmp/"$input"
fi
Thank you to #Robert Seaman for reminding me to use if then else instead of case