diff --git a/github/check.owncloud.update.sh b/github/check.owncloud.update.sh
new file mode 100755
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--- /dev/null
+++ b/github/check.owncloud.update.sh
@@ -0,0 +1,348 @@
+#!/bin/sh
+#
+# Purpose {{{
+## Create a temp file (to monitor) if an upgrade is available for Owncloud Core
+## project on Github or one of it's application.
+#   1. Get current version from APT repo (by default).
+#   1.b Or use version from version.php file (with --file-mode option).
+#   2. Get latest version from github repository.
+#   3. Compare current and new versions.
+#   4. …
+#   5. Create a temp file (to monitor) if an upgrade is available.
+#
+# 2023-03-04
+# }}}
+# How-to use {{{
+## 1. Needs releasetags script, in the same directory
+## cf. https://git.ipr.univ-rennes.fr/cellinfo/scripts/src/master/github/releasetags
+# wget https://git.ipr.univ-rennes.fr/cellinfo/scripts/raw/master/github/releasetags
+## 2. Create a cron job, eg :
+#00 20 * * * root /opt/repos/ipr.scripts/github/check.owncloud.update.sh
+## 2-1 Create a cron job to compare the current version from version.php file (default to: /var/www/owncloud/version.php)
+#00 20 * * * root /opt/repos/ipr.scripts/github/check.owncloud.update.sh --file-mode
+## 2-2 Create a cron job to compare the current version from version.php file on a specific location
+#00 20 * * * root /opt/repos/ipr.scripts/github/check.owncloud.update.sh --file /srv/www/owncloud/version.php
+## 3. Monitor the temp file : /tmp/.github.owncloud.upgrade
+# }}}
+# Flags {{{
+## Exit on error
+set -o errexit
+## Exit on unset var
+### Use "${VARNAME-}" to test a var that may not have been set
+set -o nounset
+## Pipeline command is treated as failed
+### Not available in POSIX sh − https://github.com/koalaman/shellcheck/wiki/SC3040
+#set -o pipefail
+## Help with debugging
+### Call the script by prefixing it with "TRACE=1 ./script.sh"
+if [ "${TRACE-0}" -eq 1 ]; then set -o xtrace; fi
+# }}}
+# Vars {{{
+PROGNAME=$(basename "${0}"); readonly PROGNAME
+PROGDIR=$(readlink --canonicalize-missing $(dirname "${0}")); readonly PROGDIR
+ARGS="${*}"; readonly ARGS
+readonly NBARGS="${#}"
+[ -z "${DEBUG-}" ] && DEBUG=1
+## Export DEBUG for sub-script
+export DEBUG
+
+## Default values for some vars
+readonly PACKAGE_NAME_DEFAULT="owncloud-complete-files"
+readonly VERSION_PHP_FILE_DEFAULT="/var/www/owncloud/version.php"
+readonly CHECK_MODE_DEFAULT="repository"
+
+## Colors
+readonly PURPLE='\033[1;35m'
+readonly RED='\033[0;31m'
+readonly RESET='\033[0m'
+readonly COLOR_DEBUG="${PURPLE}"
+# }}}
+usage() {                                                       # {{{
+
+	cat <<- HELP
+usage: $PROGNAME [-d|-f|-h|-p|-r]
+
+Try to compare current version of installed Owncloud with latest version on Github.
+
+EXAMPLES :
+    - Default - Check current version from installed package with APT repository (default package name: ${PACKAGE_NAME_DEFAULT})
+        ${PROGNAME}
+        ${PROGNAME} --repo-mode
+
+    - Check current version from a specific .deb package name
+        ${PROGNAME} --package owncloud-server
+
+    - Check current version from Owncloud's version.php file (default location: ${VERSION_PHP_FILE_DEFAULT})
+        ${PROGNAME} --file-mode
+
+    - Check current version from Owncloud's version.php file on specific location (auto set file-mode)
+        ${PROGNAME} --file /srv/www/owncloud/version.php
+
+OPTIONS :
+    -d,--debug
+        Enable debug messages.
+
+    --file-mode
+        Get current Owncloud's version from version.php file.
+
+    -f,--file
+        Define version.php file location.
+        Default: ${VERSION_PHP_FILE_DEFAULT}
+
+    -h,--help
+        Print this help message.
+
+    -p,--package
+        Define the .deb package name to parse.
+        Default: ${PACKAGE_NAME_DEFAULT}
+
+    -r,--repo-mode,--repo,--repository
+        (default) Get current Owncloud's version of .deb package version from APT repository.
+HELP
+}
+# }}}
+debug_message() {                                               # {{{
+
+	local_debug_message="${1}"
+
+	## Print message if DEBUG is enable (=0)
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
+
+	unset local_debug_message
+
+	return 0
+}
+# }}}
+error_message() {                                               # {{{
+
+	local_error_message="${1}"
+	local_error_code="${2}"
+
+	## Print message
+	printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}" >&2
+
+	unset local_error_message
+
+	exit "${local_error_code:=66}"
+}
+# }}}
+is_var_empty() {                                                # {{{
+
+	local_var_empty="${1}"
+	debug_prefix="${2:-}"
+	## Return False by default
+	return_var_empty="1"
+
+	debug_message "${debug_prefix}is_var_empty − Test var value (${1})."
+	[ -z "${local_var_empty}" ] && return_var_empty="0"
+
+	unset debug_prefix
+	unset local_var_empty
+
+	return "${return_var_empty}"
+}
+# }}}
+define_vars() {                                                 # {{{
+
+	debug_message "-- define_vars BEGIN"
+	## If repo_url wasn't defined {{{
+	is_var_empty "${repo_url-}" "|| " \
+		&& repo_url="https://github.com/owncloud/core" \
+		&& debug_message "| define_vars − Use value (${RED}${repo_url}${COLOR_DEBUG}) for repo_url variable."
+	## }}}
+	## If package_name wasn't defined (argument) {{{
+	## Use default value
+	is_var_empty "${package_name-}" "|| " \
+		&& debug_message "| define_vars − Use default value (${RED}${PACKAGE_NAME_DEFAULT}${COLOR_DEBUG}) for package_name variable." \
+		&& package_name="${PACKAGE_NAME_DEFAULT}"
+	## }}}
+	## Get new_version from application repository {{{
+	new_version=$("${PROGDIR}"/releasetags "${repo_url}" | grep -vE -- '(dev|rc)' | head -n1 | sed 's/v//g')
+	if is_var_empty "${new_version-}" "|| "; then
+		error_message "define_vars − Invalid value for ${package_name} new version (${new_version})." 1
+	else
+		debug_message "| define_vars − Get value (${RED}${new_version}${COLOR_DEBUG}) for new_version variable."
+	fi
+	## }}}
+	## If new_version_file wasn't defined {{{
+	is_var_empty "${new_version_file-}" "|| " \
+		&& new_version_file="/tmp/.github.${package_name}.upgrade" \
+		&& debug_message "| define_vars − Use value (${RED}${new_version_file}${COLOR_DEBUG}) for new_version_file variable."
+	## }}}
+	## If check_mode wasn't defined (argument) {{{
+	## Use default value
+	is_var_empty "${check_mode-}"  "|| " \
+		&& debug_message "| define_vars − Use default value (${RED}${CHECK_MODE_DEFAULT}${COLOR_DEBUG}) for check_mode variable." \
+		&& check_mode="${CHECK_MODE_DEFAULT}"
+	## }}}
+
+	## Get current_version according to the check_mode {{{
+	case "${check_mode}" in
+		"repo"|"repository" )  ## Check current version from repository
+			current_version=$(apt-cache policy -- "${package_name}" | awk '/Installed:/ {print $2}' | sed 's/.:\(.*\)-.*/\1/')
+			;;
+		"file" )               ## Check current version from installed .deb file
+			current_version=$(sed --silent "s/^\$OC_VersionString = '\(.*\)';/\1/p" "${version_php_file}")
+			;;
+		* )                    ## unknow mode
+			error_message "define_vars − Invalid check mode: ${check_mode}. See help message with -h." 2
+			;;
+	esac
+
+	## If current_version is empty
+	is_var_empty "${current_version}"  "|| " \
+		&& error_message "define_vars − Error with current_version variable (${current_version}) for package (${package_name})." 2
+	## }}}
+	debug_message "-- define_vars END"
+}
+# }}}
+is_version_greater_than() {                                     # {{{
+
+	first_value="${1}"
+	value_to_compare="${2}"
+	debug_prefix="${3:-}"
+
+	## Return False by default
+	return_is_version_greater_than="1"
+
+	debug_message "${debug_prefix}is_version_greater_than − \
+Is first value (${first_value}) greater than the second value (${value_to_compare})."
+
+	if printf '%s\n' "${first_value}" "${value_to_compare}" | sort --check=quiet --version-sort; then
+		debug_message "${debug_prefix}is_version_greater_than − ${first_value} <= ${value_to_compare} ."
+		return_is_version_greater_than="1"
+	else
+		debug_message "${debug_prefix}is_version_greater_than − ${first_value} > ${value_to_compare} ."
+		return_is_version_greater_than="0"
+	fi
+
+	unset first_value
+	unset value_to_compare
+	unset debug_prefix
+
+	return "${return_is_version_greater_than}"
+}
+# }}}
+
+main() {                                                        # {{{
+
+	debug_message "--- MAIN BEGIN"
+
+	## Define all vars
+	define_vars
+
+	## Uncomment variable(s) to simulate different behaviour
+	#current_version="10.13.2"
+	#current_version="10.13.2-3+1.1"
+	#new_version="10.19.2"
+
+	debug_message "-- Test version BEGIN"
+	## If new_version is greater than current_version {{{
+	if is_version_greater_than "${new_version}" "${current_version}" "|| "; then
+		debug_message "| Current version (${current_version}) is older than new one \
+(${new_version})."
+	## }}}
+	## If current version is uptodate {{{
+	else
+		debug_message "| Current version (${current_version}) seems uptodate \
+or newer than available version (${new_version})."
+		### Ensure to remove any temp file and useless .deb files
+		rm --force -- "${new_version_file}"
+		### Exit
+		debug_message "-- Test version END"
+		debug_message "--- MAIN END"
+		exit 0
+	fi
+	## }}}
+	debug_message "-- Test version END"
+
+	debug_message "--- MAIN END"
+
+	# Exit
+	exit 0
+}
+# }}}
+
+# Manage arguments                                                # {{{
+# This code can't be in a function due to argument management
+
+if [ ! "${NBARGS}" -eq "0" ]; then
+
+	manage_arg="0"
+
+	## If the first argument ask for help (h|help|-h|-help|-*h|-*help) {{{
+	if printf -- '%s' "${1-}" | grep --quiet --extended-regexp -- "^-*h(elp)?$"; then
+		usage
+		exit 0
+	fi
+	## }}}
+
+	## If the first argument is not an option
+	if ! printf -- '%s' "${1}" | grep --quiet --extended-regexp -- "^-+";
+	then
+		## Print help message and exit
+		printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+		printf '%b\n' "---"
+		usage
+
+		exit 1
+	fi
+
+	# Parse all options (start with a "-") one by one
+	while printf -- '%s' "${1-}" | grep --quiet --extended-regexp -- "^-+"; do
+
+	case "${1}" in
+		-d|--debug )                          ## debug
+			DEBUG=0
+			debug_message "--- Manage argument BEGIN"
+			;;
+		-p|--package )                        ## Define package_name
+			## Move to the next argument
+			shift
+			## Define var
+			readonly package_name="${1}"
+			;;
+		-f|--file )                           ## Define version_php_file
+			## Move to the next argument
+			shift
+			## Define var
+			readonly version_php_file="${1}"
+		                                      ## AND set check_mode to file mode
+			readonly check_mode="file"
+			;;
+		--file-mode )                         ## Define check_mode to file mode
+			## Define var
+			readonly check_mode="file"
+			;;
+		-r|--repo-mode|--repo|--repository )  ## Define check_mode to repo mode
+			## Define var
+			readonly check_mode="repo"
+			;;
+		* )                                   ## unknow option
+			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+			printf '%b\n' "---"
+			usage
+			exit 1
+			;;
+	esac
+
+	debug_message "| ${RED}${1}${COLOR_DEBUG} option managed."
+
+	## Move to the next argument
+	shift
+	manage_arg=$((manage_arg+1))
+
+	done
+
+	debug_message "| ${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
+else
+	debug_message "| No arguments/options to manage."
+fi
+
+	debug_message "--- Manage argument END"
+# }}}
+
+main
+
+# This should never be reach
+exit 255