WebLogic Startup scripts for linux servers7

Below are the weblogic startup scripts beingused in our enviorment, just I would like to under the sepration of .log and .out file . What exactly get filtered into .out file and .log file ?

Please find the scripts

DOM_HOME=xxxxx
export DOM_HOME
DOM_NAME=`basename $DOM_HOME`
INST_HOME="$DOM_HOME"/servers
INST_NAME=SherlockAdminSvr
export INST_NAME

today=`date "+%Y%m%d"`
uniqvar=`date +%H%M`

function ps() {
    command ps "$@" 2>/dev/null
}

INST_PSINFO=`ps auxwww | grep "Java8" | grep $INST_NAME | wc -l`

if [ -n "$1" ]
then
        echo "Usage: ./AdminSvr.sh"
        exit
fi

if [ "$INST_PSINFO" -eq 0 ]
then

        if [ -d "${INST_HOME}/${INST_NAME}" ]