A bash script for low-end machines (mostly RPis) that sometimes crash when updating too many packages at the same time

apt-nice-update.sh

#!/bin/bash
# - Runs apt-get upgrade for each individual package to avoid killing low-end machines -

DATA=$(apt-get upgrade -s -y -q | grep "Inst " | cut -d ' ' -f 2)

PACKAGES=(${DATA// / })
Z=0

for package in "${PACKAGES[@]}";
do
    echo ""
    echo ""
    echo "apt-get install -y -q $package"
    bash -c "nice apt-get install -y -q $package"
    bash -c "nice apt-get clean -y -q"

    Z=$((Z+1))

    # update only first 50 packages, just to be sure that we won't kill our machine by running this script
    if [[ $Z -eq 50 ]];
    then
        break
    fi
done