correct shell or excutable invocation

    SHELL=$(ps -p $$ | awk '$1 == PP {print $4}' PP=$$)

fi

## detect how called (e.g., bash converrt.sh or ./launch_universc.sh)

if [[ $(which launch_universc.sh) == *"/"* ]]; then

if [[ $(which launch_universc.sh) == *"/"* ]] || [[ $0 == *"/"* ]]; then

    SHELL=''

    invocation=$0

else

    if [[ -z $ZSH_VERSION ]]; then

    if [[ ! -z $ZSH_VERSION ]]; then

        SHELL="zsh"

    elif [[ -z $KSH_VERSION ]]; then

    elif [[ ! -z $KSH_VERSION ]]; then

       SHELL="ksh"

    elif [[ -z $FISH_VERSION ]]; then

    elif [[ ! -z $FISH_VERSION ]]; then

       SHELL="fish"

    elif [[ -z $BASH_VERSION ]]; then

    elif [[ ! -z $BASH_VERSION ]]; then

        SHELL="bash"

    else

       SHELL=$SHELL