diff --git a/github/check.glpi-agent.update b/github/check.glpi-agent.update
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+#!/bin/sh
+# Purpose {{{
+## Create a temp file (to monitor) if an upgrade is available for GLPI Agent
+## project on Github − https://github.com/glpi-project/glpi-agent/releases
+## It's based on .deb package installation to check the current version.
+## It can also compare the current available version in APT repositories
+##   if "--repo" option is given.
+## How-to use {{{
+### 1. Needs releasetags script, in the same directory
+### cf. https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/github/releasetags
+# wget https://git.ipr.univ-rennes1.fr/cellinfo/scripts/raw/master/github/releasetags
+### 2. Create a cron job, eg :
+#00 20 * * * root /opt/repos/ipr.scripts/github/check.glpi-agent.update
+### 2-1 Create a cron job to compare the version available in a Debian repository :
+#00 20 * * * root /opt/repos/ipr.scripts/github/check.glpi-agent.update --repo
+### 3. Monitor the temp file : /tmp/.github.glpi-agent.upgrade
+# Or enable MAILTO in cronjob and edit the script to print a message.
+# Or send a mail.
+# …
+## }}}
+# }}}
+
+# Vars {{{
+PROGNAME=$(basename "${0}"); readonly PROGNAME
+PROGDIR=$(readlink -m $(dirname "${0}")); readonly PROGDIR
+ARGS="${*}"; readonly ARGS
+readonly NBARGS="${#}"
+[ -z "${DEBUG}" ] && DEBUG=1
+## Export DEBUG for sub-script
+export DEBUG
+
+## Default values for some vars
+### Don't use APT repository by default
+readonly REPOSITORY_MODE_DEFAULT=1
+
+readonly GLPI_AGENT_REPO_URL="https://github.com/glpi-project/glpi-agent"
+readonly GLPI_AGENT_NEW_VERSION_FILE="/tmp/.github.glpi-agent.upgrade"
+
+## Colors
+readonly PURPLE='\033[1;35m'
+readonly RED='\033[0;31m'
+readonly RESET='\033[0m'
+readonly COLOR_DEBUG="${PURPLE}"
+# }}}
+usage() {                                                       # {{{
+
+	cat <<- HELP
+usage: $PROGNAME [-d|-h|-r]
+
+Compare GLPI Agent installed version and latest one.
+
+EXAMPLES :
+    - Compare the current version installed from .deb file
+        ${PROGNAME}
+
+    - Compare the current version from apt's repository
+        ${PROGNAME} --repo
+
+OPTIONS :
+    -d,--debug
+        Enable debug messages.
+
+    -h,--help
+        Print this help message.
+
+    -r,--repo,--repository
+        Use GLPI Agent version from APT repository.
+HELP
+
+}
+# }}}
+debug_message() {                                               # {{{
+
+	local_debug_message="${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}${RESET}"
+
+	unset local_error_message
+
+	exit "${local_error_code:=66}"
+}
+# }}}
+define_vars() {                                                 # {{{
+
+	## If repository_mode wasn't defined (argument) {{{
+	if [ -z "${repository_mode}" ]; then
+		## Use default value
+		readonly repository_mode="${REPOSITORY_MODE_DEFAULT}"
+	fi
+	# }}}
+
+}
+# }}}
+is_var_empty() {                                                # {{{
+
+	## Return False by default
+	return_var_empty="1"
+	## Total number of variables to test
+	local_total_var="${#}"
+
+	loop_count_var_empty="0"
+
+	## While it remains a variable to test
+	while [ "${local_total_var}" -gt "${loop_count_var_empty}" ]; do
+		debug_message "is_var_empty − \
+Test var: ${1}."
+		### Test if this is empty and set return value to True
+		[ -z "${1}" ] && return_var_empty="0"
+
+		### Increase the number of tested variables
+		loop_count_var_empty=$((loop_count_var_empty+1))
+
+		### Shift to the next variable
+		shift
+	done
+
+	unset local_total_var
+	unset loop_count_var_empty
+
+	return "${return_var_empty}"
+}
+# }}}
+
+main() {                                                        # {{{
+
+	## Define all vars
+	define_vars
+
+  ## Get current version from APT repository or from .deb package {{{
+
+	if [ "${repository_mode}" -eq "0" ]; then
+		debug_message "--- MAIN Check current version from ${RED}APT repositories${COLOR_DEBUG}."
+		glpi_agent_current_version=$(apt-cache policy glpi-agent \
+			| awk '/Candidate:/ {print $2}' \
+			| sed 's/.:\(.*\)-.*/\1/')
+	else
+		debug_message "--- MAIN Check current version from ${RED}manually installed .deb package${COLOR_DEBUG}."
+		glpi_agent_current_version=$(dpkg -l glpi-agent \
+			| awk '/^ii.*glpi-agent/ {print $3}' \
+			| sed 's/.:\(.*\)-.*/\1/')
+	fi
+	## }}}
+	## Get latest version from project repository {{{
+	### OR Exit with error message
+		debug_message "--- MAIN Check latest version from project repository (${RED}${GLPI_AGENT_REPO_URL}${COLOR_DEBUG})."
+	glpi_agent_latest_version=$("${PROGDIR}/releasetags" "${GLPI_AGENT_REPO_URL}" | head --lines=1 \
+		|| error_message "Can't get latest GLPI Agent version from repository (${GLPI_AGENT_REPO_URL})." 02 )
+	## }}}
+
+	## If any of the two variables is empty {{{
+	### OR Exit with error message
+	is_var_empty "${glpi_agent_current_version}" "${glpi_agent_latest_version}" \
+		&& error_message "At least one variable is empty (current version : ${glpi_agent_current_version}, latest version : ${glpi_agent_latest_version}) !" 04
+	## }}}
+
+	# Check if the current version is the last one {{{
+	## If the two versions are the same {{{
+	if [ "${glpi_agent_current_version}" = "${glpi_agent_latest_version}" ]; then
+		debug_message "Test version − \
+The current GLPI Agent version (${RED}${glpi_agent_current_version}${COLOR_DEBUG}) is up-to-date."
+
+		### Ensure to remove any temp file
+		rm --force -- "${GLPI_AGENT_NEW_VERSION_FILE}"
+
+		exit 0
+	## }}}
+	## If the versions are different {{{
+	else
+		debug_message "Test version − \
+Current version (${RED}${glpi_agent_current_version}${COLOR_DEBUG}) and latest one (${RED}${glpi_agent_latest_version}${COLOR_DEBUG}) seems to be different."
+
+		## Create a temp file to monitor
+		touch -- "${GLPI_AGENT_NEW_VERSION_FILE}"
+		debug_message "An upgrade is available for Cachet (current : ${glpi_agent_current_version}) : ${glpi_agent_latest_version}." >> "${GLPI_AGENT_NEW_VERSION_FILE}"
+
+		exit 0
+	fi
+	## }}}
+	# }}}
+}
+# }}}
+
+# Manage arguments                                                # {{{
+# This code can't be in a function due to argument management
+
+if [ ! "${NBARGS}" -eq "0" ]; then
+
+	manage_arg="0"
+
+	## If the first argument is not an option
+	if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
+	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' "${1}" | grep -q -E -- "^-+"; do
+
+	case "${1}" in
+		--debug )                             ## debug
+			DEBUG=0
+			debug_message "--- Manage argument BEGIN"
+			;;
+		-h|--help )                           ## help
+			usage
+			## Exit after help informations
+			exit 0
+			;;
+		-r|--repo|--repository )              ## Set repository_mode
+			repository_mode=0
+			;;
+		* )                                   ## 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
+
+exit 255