How to save an exit code to a variable in bash script

Published on February 08, 2021

Tagged: #developer-experience #devops

Follow me on twitter for more posts like this

I had to save the exit code from one part of the script that runs a suite of tests, then run some cleanup and finally return the exit code received previously from the tests.

I haven’t used bash scripts too often in my work so when I had to do this recently I had to spend some time looking up syntax.

This will fail the tests correctly in our Azure Devops pipeline while still cleaning up the docker containers.

The script

The part I found difficult here was the escaping. Sometimes you need double quotes and other times it’s just the variable. This is a reference in case I ever have to do this again!

Note that to run this you will have to give it permissions chmod 755 myscript.sh

#!/bin/bash

main (){
   docker-compose run node
   exitCode=$?

   echo "exitCode will be $exitCode"
}

setup(){
   yarn
   docker-compose up -d chromedriver
   docker ps -a
}

tearDown(){
    docker-compose down
    docker system prune -f
}

setup
main
tearDown

exit "$exitCode"
Darragh ORiordan

Hi! I'm Darragh ORiordan.

I live and work in Sydney, Australia enjoying the mountains and the ocean.

I build and support happy teams that create high quality software for the web.

Contact me on Twitter!


Read more articles like this one...

List of article summaries

#developer-experience

Modern shell tooling for devs on MacOS and Windows WSL

Many of the terminal tools that come with unix environments like MacOS and Windows WSL are functionally similar to how they were 20 years ago. But developer tooling has advanced quite a bit since then.

You can replace many of these cli tools with equivalents that support full colour, unicode icons, git and more. Changing OS and git defaults will better match your workflow.

Your prompt can be made git aware and use colour to indicate state so you don’t have to query git so often.

I work on MacOS and Windows machines and I’ll show you how to have the same terminal and experience on both.

#developer-experience

How engineers can help deliver software effectively

Delivery managers and team leads have the responsibility to deliver a software system via an engineering team.

Your customer wants every feature to work perfectly and they want it delivered yesterday. Your team wants to learn and grow.

It’s a tough role managing all the stakeholders and creators in a project.

Engineers can help drive great delivery by empathising with and supporting the delivery manager or leads in a project team.

#developer-experience

How to identify a great tech organisation before you join

No one wants to waste time working for an organisation that’s a bad fit. But how do you know a good place from a bad place until you actually work there?

It’s important to spend the same amount of time analysing a potential organisation as they spend analysing you!

During an interview process an organisation has personality testing, resumes, tech testing, behavioural testing, reference checks, bank checks, police checks and more.

If it sounds like a very one-sided process that’s because it is! But there are ways you can bring more balance and here are some important things to research before accepting any engineering job offer.

#developer-experience

Set vscode as the default for text files on mac

How to set the default text editor to be visual studio code on the mac

Update 29 Jan 2022 - I added this and more to comprehensive instructions for configuring a modern developer shell and MAcOS in another article here. You should check that out.