When I first found shellcheck, I'd sit on the train every morning and fix all the stupid little bugs in all our shell code. I learned a TON about shell scripting, because the shellcheck wiki is amazing. We had some redhat 6 init scripts checked into our repos, and shellcheck helpd me find syntax errors in those init scripts. If Redhat can't reliably write shell scripts without a linter, or catch bugs from upstream, what makes us think we're any better?
I wouldn't write serious programs in another language without a linter. Why should I write shell scripts without one?
All these comments here "Uhhh just use PythoN!" Yeah? I write scripts that need to run on macOS. No Python there. Yeah I can have my script sit there and pull the command line tools in an automated way and wait the 20 minutes it takes to install or I can pull on my big boy pants and just figure out how to do it in shell. It's turing complete. It works. Whatever.
Thanks GPLv3