source: vendor/bash/3.1/examples/functions/shcat2

shcat()
{
        while read -r line
        do
                echo "$line"
        done
}

shcat2()
{
        while [ $# -ge 1 ]; do
                case "$1" in
                -)      shcat ;;
                *)      shcat < "$1" ;;
                esac
                shift
        done
        exit 0
}