Debian/Ubuntu

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Script to update everything:

/usr/local/sbin/update-all:

#!/bin/bash

if [[ $EUID -ne 0 ]]; then
 echo "This script must be run as root." 1>&2
 exit 1
fi

/usr/bin/apt-get update && \
/usr/bin/apt-get dist-upgrade -y && \
/usr/bin/apt-get autoremove -y

if [ -f /var/run/reboot-required ]; then
 echo "One or more updates require a reboot of the machine." 1>&2
fi

To run it in cron as root:

 SHELL=/bin/bash
 PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
 
 # m h  dom mon dow   command
 0 3 * * * /usr/local/sbin/update-all > /var/log/update-all.log 2>&1