Ubuntu-Debian APT upgrade script

system_update.sh

#!/bin/bash
# "system_update"
# Brady Shea
# Creation:    18SEP2020 - conversion of system_update alias to bash script
# Last update: 17APR2026 - cleaned up some of my messy bash printf strings
#      update: 13DEC2024 - fixed distro string for debian, added uptime to info presented
# Original location: https://gist.github.com/bmatthewshea/6ef60db227d52f39200029312dd5446a
# Author Website: https://www.holylinux.net/
#
# Place this script in "/usr/local/sbin/system_update", or similar location under your $PATH
# It needs root permissions (SUDO) to execute.
#
# Change these settings to your liking:
#################################
noprompting=true                # ( true | false ) (APT option:  -y, --yes, --assume-yes)
sleepy=5                        # (in secs) (Pause a bit between autoremoves and updates)
bootpartitionwarning=102400     # (in KiB)  (102400 KiB = ~100MiB  - a reasonable amount)
#################################

# STATIC VARIABLES #
BRIGHT_RED=$(tput bold)$(tput setaf 1)
#BRIGHT_GREEN=$(tput bold)$(tput setaf 2)
GREEN=$(tput setaf 2)
BRIGHT_YELLOW=$(tput bold)$(tput setaf 3)
BRIGHT_WHITE=$(tput bold)$(tput setaf 7)
COLOR_OFF=$(tput sgr0)
scriptname=$(basename "$0")
bootavail=$(df --output=avail /boot | tail -n 1)
rebootfileflag=/var/run/reboot-required
osrelease=$(grep "PRETTY_NAME=" /usr/lib/os-release | cut -d '"' -f 2)
upt=$(uptime -p | tail -c+4)
noprompt=
if [[ $noprompting == "true" ]]; then
  noprompt=-y
fi
rebootreq=0
problems=0

# FUNCTIONS #
root_user () { [ ${EUID:-$(id -u)} -eq 0 ]; }
## No point going any further in script if not sudo:
if ! root_user; then printf "\nPlease use: \'sudo %s\'\nExiting.\n\n" "${scriptname}"; exit; fi

sleeptimer () {
  for (( count=1; count<=sleepy; count++ )); do
    printf "%s.%s" "${BRIGHT_WHITE}" "${COLOR_OFF}"; sleep 1;
  done
  printf "\n"
}

rebootcheck () {
  rebootreq="false"
  if [ -f $rebootfileflag ]; then
    rebootreq="true"
  fi
}

okaynookay () {
  showalert="${GREEN}(PASS)${COLOR_OFF}"
  if [ $problems == "1" ]; then
    showalert="${BRIGHT_RED}(FAIL)${COLOR_OFF}"
  fi
  problems=0
}

# MAIN PROGRAM #
printf "\n%sSYSTEM UPDATE STARTED%s\n\n" "${BRIGHT_YELLOW}" "${COLOR_OFF}"

printf " %sCurrent Distribution:%s %s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}" "${osrelease}"

if [[ $bootavail -lt bootpartitionwarning ]]; then
  problems=1; okaynookay
  displaybootavail="${bootavail} KiB ${showalert}"
else
  problems=0; okaynookay
  displaybootavail="${bootavail} KiB ${showalert}"
fi
printf " %sAvailable /boot space:%s %s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}" "$displaybootavail"

rebootcheck ## (pre update)
if [[ $rebootreq == "true" ]]; then
  problems=1; okaynookay;
  displayrebootreq="${rebootreq} ${showalert}"
else
  problems=0; okaynookay;
  displayrebootreq="${rebootreq} ${showalert}"
fi
printf " %sReboot required currently:%s %s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}" "$displayrebootreq"

printf " %sUptime:%s %s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}" "${upt}"

if [[ $rebootreq == "true" || $bootavail -lt $bootpartitionwarning ]]; then
  while true; do
    read -n 1 -rp " $(printf "\n You have warnings. Proceed anyway? [y/N] ")" userinput
    echo
    case $userinput in
      [Yy]* ) break;;
      [Nn]* ) exit;;
      * ) exit;;
    esac
  done
fi

## START UPDATE ##
printf "\n%sUpdating from sources..%s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}"
apt update

printf "\n%sRunning autoremove before updates..%s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}"
apt ${noprompt} autoremove

printf "\n%sAutoremove completed. Sleeping %s seconds%s" "${BRIGHT_WHITE}" "${sleepy}" "${COLOR_OFF}"; sleeptimer

printf "\n%sInstalling any upgrades found..%s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}"
apt ${noprompt} upgrade

printf "\n%sUpdates have completed. Sleeping %s seconds%s" "${BRIGHT_WHITE}" "${sleepy}" "${COLOR_OFF}"; sleeptimer

printf "\n%sRe-running autoremove post-updates..%s\n" "${BRIGHT_WHITE}" "${COLOR_OFF}"
apt ${noprompt} autoremove

rebootcheck ## (post update)
if [[ $rebootreq == "true" ]]; then
    printf "\n %s*** A system reboot is required. ***\n" "${BRIGHT_RED}" "${COLOR_OFF}"
else
    printf "\n %sA system reboot is NOT required at this time.%s\n" "${GREEN}" "${COLOR_OFF}"
fi
printf "\n%sSYSTEM UPDATE COMPLETED. Exiting.%s\n\n" "${BRIGHT_YELLOW}" "${COLOR_OFF}"

Updated. Made more compliant and fixed printf to use %s. Various other improvements.

Updated. Made more compliant and fixed printf to use %s. Various other improvements.

Very nice. I'll give it a shot this weekend. I'll have to share my latest bash_profile which shows a little more info than neofetch (or similar) shows.