gistfile1.txt

#!/bin/bash
export MIRROR_DIR="/opt/dists/redhat/rhel-i386-server-5/"
[ -d ${MIRROR_DIR} ] || mkdir -p ${MIRROR_DIR}
yum clean all
export LIST=""
export LIST_COUNTER=0
export LIST_MAX=50 # not sure where the sweet spot is.
yum list available | awk ' {
                   if(on){if((NF==1)||(NF==3)){print $1;}}
                   if($0~"^Available Packages"){on=1;}
                 }'| \
    sed -e 's/\.i386$//' -e 's/\.noarch//' | \
    while read line;do
        rpmname=$(yum info $line |sed -e 's/ //g'| awk -F: '{
                                   if($1~"^Name *"){n=$2;}
                                   if($1~"^Version *"){v=$2;}
                                   if($1~"^Release *"){r=$2;}
                                   if($1~"^Arch *"){a=$2;}
                                 } END { print n"."v"."r"."a".rpm" }')
        if [ ! -f "${MIRROR_DIR}/${rpmname}" ];then
            echo "Adding: $line [$rpmname]"
            LIST="${LIST} ${line}"
            LIST_COUNTER=$(expr ${LIST_COUNTER} + 1)
            if [ ${LIST_COUNTER} -ge ${LIST_MAX} ];then
               yum  install -y --downloadonly $LIST --downloaddir=${MIRROR_DIR}
              export LIST=''
              export LIST_COUNTER=0
           fi
        fi
    done
    yum  install -y --downloadonly $LIST --downloaddir=${MIRROR_DIR}
# automerge