It's easy to get on the fly syntax checking in Emacs (aka
linting). You just two things: shellcheck and flycheck-mode.
The former is a shell command which on Debian based systems can be installed with:
# apt-get install shellcheck
The other thing you need is the Emacs plugin flycheck which can be
installed in Emacs with:
M-x package-install RET flycheck
Now, you're all set. If you enable flycheck in your .sh buffers, you
get on the fly syntax checking!
