Task: Test if a Variable is Set in Bash When Using "set -o nounset"

Task: Test if a Variable is Set in Bash When Using "set -o nounset": a task in Terminal-Lego-15k (Harbor dataset). When using set -o nounset (or set -u ) in Bash scripts, the script will exit with an "unbound variable" error if you try to use a variable that hasn't been set. This is a useful…