Simple script for checking if certain commands are installed and prompt the user to install them if not

setup.sh

#! /bin/bash

function prompt {
	while true; do
	    read -p "$1 is not installed. Do you wish to install it? [y/n]:" yn
	    case $yn in
	        [Yy]* ) return 1;;
	        [Nn]* ) return 0;;
	        * ) echo "Please answer yes or no.";;
	    esac
	done
}

function check {
	command -v $1 >/dev/null 2>&1 || { 
		if prompt "$2" $1;
			then echo "Aborting...";
			else $3; 
		fi
	}
}

# Syntax: check command display_name install_command
check /bin/foo "Foo" "echo Executing some install command :)"