bash : how-to build cmd dynamically , get both STDOUT and STDERR output of it , log it and exit if fatal

# build the command

    cmd="chown -Rv $RunUser:$RunUserGroup $ProductDir"

# get the command output both STDERR and STDOUTPUT into a var

    Msg=$($cmd 2>&1)

    [ $? -eq 0 ] || Exit "ERROR : FATAL : Failed to run the $cmd command with $Msg output!!!"

wlog(){

        # check terminal if exists echo 

        test -t 1 && echo "`date +%Y.%m.%d-%H:%M:%S` [$$] $*"

        # check LogFile and 

        test -z $LogFile || {

          echo "`date +%Y.%m.%d-%H:%M:%S` [$$] $*" >> $LogFile

        } #eof test

 } 

# eof function wlog 

Exit(){

    ExitStatus=0

    case $1 in

        [0-9]) ExitStatus="$1"; shift 1;;

    esac

    Msg="$*"

    test "$ExitStatus" = "0" || Msg="ERROR: $Msg"

    wlog "$Msg"

    exit $ExitStatus

}

#eof function Exit