How to read user input after flags

Question

I'm writing a bash script that downloads and compiles a program and I don't know what i should be looking up to accomplish what I want, so here I go...

What I want:

sudo pacstall -I program

What it does now

sudo pacstall -I

then I would type in program to install program.

So how do I get it to 'ask for input' after typing in the -I flag (I for install)? I'm very new to bash scripting so any help is appreciated.

Answer 1

echo -n 'Enter the package name: '
read package
test -n "$package" && sudo pacstall -I "$package"

Answer 2

Coming back to this a year later, this was a pretty stupid question. The answer is positional variables, like $1, $2, etc