How To Write A Bash Install Script . The first line (echo welcome) prints the line welcome into the terminal. Create a text file and make it executable and add in exectable pieces of code. Comment exécuter des scripts install.sh dans un terminal Linux from fr.wikihow.com Create a text file and make it executable and add in exectable pieces of code. It is important to understand that writing a bash script is very similar to simply entering commands in your terminal. The first thing we need to do, is to download the installer.