Overview

GitHub Actions are incredibly powerful, but have something of a learning curve, and most things past the most basic workflows require some scripting or less discoverable features.

Shell types

I recommend you simply use Bash as your default shell, making your scripts more portable and easier to share.

String Manipulation

Uppercase / Lowercase

TESTVALUE="Hello World"
UPPERCASED=${TESTVALUE^^}    # HELLO WORLD
TITLECASED=${TESTVALUE^}     # Hello world
LOWERCASED=${TESTVALUE,,}    # hello world
FIRSTCHARLOWER=${TESTVALUE,} # hello World

Newer version of Bash has these operators:

TESTVALUE="Hello World"
UPPERCASED=${TESTVALUE@U}    # HELLO WORLD
TITLECASED=${TESTVALUE@u}     # Hello world
LOWERCASED=${TESTVALUE@L}    # hello world