what does this script do

#!/bin/sh

export ADMINMAIL=ltc-administrators@
export REPOHOME=/srv/localrepo
export DISTROLIST=$REPOHOME/dist-version
export EXCLUDELIST=$REPOHOME/exclude-sync-dirs
export REPOSITORY="mirrors.usinternet.com::centos"
export TIMESTAMP=$(date +%Y%m%d)
export OUTPUTFILE=/tmp/centos-local-repo-sync.$TIMESTAMP
export ERRORFILE=/tmp/centos-local-repo-sync.error.$TIMESTAMP

rsync -rltpDv --stats -h --files-from=${DISTROLIST} --exclude-from=${EXCLUDELIST} ${REPOSITORY} ${REPOHOME} > ${OUTPUTFILE} 2> ${ERRORFILE}

if [ $? -gt 0 ]; then
        cat $OUTPUTFILE | mail -s "ERROR: CentOS Local Repository Sync Job" -a $ERRORFILE $ADMINMAIL
fi

export CHANGECOUNT=$(find /srv/localrepo/ -newer /srv/localrepo/lastrun.rsync | wc -l)

if [ $CHANGECOUNT -gt 0 ]; then
        cat $OUTPUTFILE | mail -s "Updated CentOS Repository Files" $ADMINMAIL
fi

mv -f $OUTPUTFILE /srv/localrepo/lastrun.rsync

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