There is a simple, useful idiom to make your bash scripts more robust - ensuring they always perform necessary cleanup operations, even when something unexpected goes wrong. The secret sauce is a pseudo-signal provided by bash, called EXIT, that you can trap; commands or functions trapped on it will execute when the script exits for any reason. Let’s see how this works.

The basic code structure is like this:

function finish {
  # Your cleanup code here
trap finish EXIT

Source: How “Exit Traps” Can Make Your Bash Scripts Way More Robust And Reliable

Something to try to keep in mind!