source: vendor/bash/3.1/tests/read3.sub

# non-interactive

# error
read -n -1

# from pipe -- should work, but doesn't change tty attributes
echo abcdefg | {
        read -n 3 xyz
        echo $xyz
}

# fewer chars than specified
echo ab | {
        read -n 3 xyz
        echo $xyz
}

read -n 1 < $0
echo "$REPLY"