find-traverse.sh

function traverse() {
    find $1 -mindepth 1 -maxdepth 1 ! -type d -exec echo "$2"{} \; 
    for d in $(find $1 -mindepth 1 -maxdepth 1 -type d ! -name ".")
    do
        # if you just need files comment out next line
        echo "$2$d"
        traverse "$d" "${2}  "
    done
}

traverse $1

Output

• ./test.sh
• ./testA
  • ./testA/dat2
  • ./testA/dat1
  • ./testA/testB
    • ./testA/testB/dat4
• ./testC
  • ./testC/dat3