mths : sdrbrg ;

# checking shell scripts on travis

Whenever I write shell scripts (usually in Bash) I find it a good practice to run shellcheck to make sure that I haven’t done any obvious mistakes, such as forgetting to quote variables (which happens every now and then).

When I was tinkering with ddns-route53 I thought that it would be nice if Travis could run shellcheck for me. I had some trouble with getting shellcheck installed, but eventually found a solution after hopping through a bunch of GitHub issues (don’t even know where I ended up).

The following .travis.yml should get you up and running in no time:

language: bash
sudo: required
dist: trusty
  - echo "deb trusty-backports universe" | sudo tee -a /etc/apt/sources.list
  - sudo apt-get update -qq
  - sudo apt-get install shellcheck -y
  - shellcheck $FILENAME

$FILENAME could also be replaced with a glob or something like $(find . -maxdepth 1 -type f -executable) if you have several files that needs to be checked.

Speaking of shell scripts, I sometimes find myself returning to Thoughtbot’s The Unix Shell’s Humble If blog post when I forget the how’s and why’s of constructing an if statement in Bash.