diff --git a/github/check.alacritty.update b/github/check.alacritty.update
deleted file mode 100755
index 605beea..0000000
--- a/github/check.alacritty.update
+++ /dev/null
@@ -1,113 +0,0 @@
-#!/bin/sh
-# Purpose {{{
-## Create a temp file (to monitor) if an upgrade is available for Alacritty
-## project on Github.
-## 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" is given as first argument.
-## 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.alacritty.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.alacritty.update repo
-### 3. Monitor the temp file : /tmp/.github.alacritty.upgrade
-# Or enable MAILTO in cronjob and edit the script to print a message.
-# Or send a mail.
-# …
-## }}}
-# }}}
-
-# Expect maximum 1 argument {{{
-if [ $# -gt 1 ]
-then
-	cat << HELP
-
-check.alacritty.update    --
-Compare current version of an installed Alacritty and the last available.
-
-EXAMPLE :
-    - Compare the current version installed from .deb file
-        check.alacritty.update
-
-    - Compare the current version from apt's repository
-        check.alacritty.update repo
-
-HELP
-
-	exit 1
-fi
-# }}}
-
-# Vars {{{
-DEBUG=1
-
-script_wd=$(dirname "${0}")
-
-alacritty_repo_url="https://github.com/barnumbirr/alacritty-debian"
-
-if [ $# -eq 1 ] && [ "${1}" = "repo" ]  ## If repository's version should be compared
-then
-	alacritty_current_version=$(apt-cache policy alacritty | awk '/Candidate:/ {print $2}' | sed 's/.:\(.*\)-.*/\1/')
-else
-	alacritty_current_version=$(dpkg -l alacritty | awk '/^ii.*alacritty/ {print $3}' | sed 's/.:\(.*\)-.*/\1/')
-fi
-
-alacritty_new_version=$("${script_wd}"/releasetags "${alacritty_repo_url}" | grep -vE -- '(dev|rc)' | head -n1 | sed 's/v//g')
-
-alacritty_new_version_file="/tmp/.github.alacritty.upgrade"
-alacritty_new_pkg_url="${alacritty_repo_url}/releases/download/v${alacritty_new_version}/alacritty_${alacritty_new_version}_amd64_bullseye.deb"
-alacritty_tmp_pkg_path="/tmp/.alacritty_${alacritty_new_version}_amd64_bullseye.deb"
-alacritty_new_pkg_path="/tmp/alacritty_${alacritty_new_version}_amd64_bullseye.deb"
-# }}}
-
-# Check if the current version is the last one {{{
-if [ "${alacritty_current_version}" != "${alacritty_new_version}" ]; then
-	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — Current version (${alacritty_current_version}) and new one (${alacritty_new_version}) seems to be different."
-
-	## If it doesn't already exists, download this new package
-	if [ ! -f "${alacritty_new_pkg_path}" ]; then
-		[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Download .deb file from Alacritty repository on Github to: ${alacritty_new_pkg_path} ."
-		wget --quiet "${alacritty_new_pkg_url}" --output-document="${alacritty_new_pkg_path}"
-	fi
-
-else
-	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — The current version is up-to-date."
-	## Ensure to remove any temp file and useless .deb file
-	rm --force -- "${alacritty_new_version_file}" "${alacritty_new_pkg_path}" "${alacritty_tmp_pkg_path}"
-	## Exit
-	exit 0
-fi
-# }}}
-
-# Verify downloaded package {{{
-
-## If the downloaded package has a size greater than zero {{{
-if [ -s "${alacritty_new_pkg_path}" ]; then
-	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Empty file ? — \
-Downloaded package looks good."
-	### Create a temp file to monitor
-	touch -- "${alacritty_new_version_file}"
-	printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for Alacritty terminal (current : ${alacritty_current_version}) : ${alacritty_new_version}." >> "${alacritty_new_version_file}"
-
-	### Exit
-	exit 0
-else
-	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Empty file ? — \
-Empty file, don't need to go further."
-	### Ensure to remove the file to monitor
-	rm --force -- "${alacritty_new_version_file}"
-
-	### Keep a record of the downloaded package because as a new release might come soon
-	mv --force -- "${alacritty_new_pkg_path}" "${alacritty_tmp_pkg_path}"
-
-	### Exit
-	exit 0
-fi
-## }}}
-
-# }}}
-
-exit 255
diff --git a/github/check.alacritty.update.sh b/github/check.alacritty.update.sh
new file mode 100755
index 0000000..13e7402
--- /dev/null
+++ b/github/check.alacritty.update.sh
@@ -0,0 +1,354 @@
+#!/bin/sh
+#
+# Purpose {{{
+# This script will try to get last version of alacritty .deb file
+# https://github.com/gardouille/alacritty-debian
+#   1. Get current version from APT repo (by default).
+#   1.b Or use version from manually installed package (with --file option).
+#   2. Get latest version from github repository.
+#   3. Compare current and new versions.
+#   4. Download the .deb file for this new version.
+#   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-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.alacritty.update
+## 2-1 Create a cron job to compare the version of manually installed package
+#00 20 * * * root /opt/repos/ipr.scripts/github/check.alacritty.update --file
+## 3. Monitor the temp file : /tmp/.github.alacritty.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 "${DEBUG-}" ] && DEBUG=1
+## Export DEBUG for sub-script
+export DEBUG
+
+## Default values for some vars
+readonly PACKAGE_NAME_DEFAULT="alacritty"
+readonly CHECK_MODE_DEFAULT="repository"
+
+## Colors
+readonly PURPLE='\033[1;35m'
+readonly RED='\033[0;31m'
+readonly RESET='\033[0m'
+readonly COLOR_DEBUG="${PURPLE}"
+# }}}
+usage() {                                                       # {{{
+
+	cat <<- HELP
+usage: $PROGNAME [-d|-h]
+
+Try to get last version of ${PACKAGE_NAME_DEFAULT} .deb file.
+
+EXAMPLES :
+    - Check ${PACKAGE_NAME_DEFAULT} version (from APT repository or manually installed file).
+        ${PROGNAME}
+
+OPTIONS :
+    -d,--debug
+        Enable debug messages.
+
+    -h,--help
+        Print this help message.
+HELP
+}
+# }}}
+debug_message() {                                               # {{{
+
+	local_debug_message="${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 "${repo_url-}" "|| " \
+		&& repo_url="https://github.com/gardouille/alacritty-debian" \
+		&& debug_message "| define_vars − Use value (${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}${COLOR_DEBUG}) for new_version variable."
+	fi
+	## }}}
+	## If new_package_filename wasn't defined {{{
+	is_var_empty "${new_package_filename-}" "|| " \
+		&& new_package_filename="${package_name}_${new_version}_amd64.deb" \
+		&& debug_message "| define_vars − Use value (${RED}${new_package_filename}${COLOR_DEBUG}) for new_package_filename variable."
+	## }}}
+	## If new_package_url wasn't defined {{{
+	is_var_empty "${new_package_url-}" "|| " \
+		&& new_package_url="${repo_url}/releases/download/v${new_version}/${new_package_filename}" \
+		&& debug_message "| define_vars − Use value (${RED}${new_package_url}${COLOR_DEBUG}) for new_package_url variable."
+	## }}}
+	## 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}${COLOR_DEBUG}) for new_version_file variable."
+	## }}}
+	## If tmp_package_path wasn't defined {{{
+	is_var_empty "${tmp_package_path-}" "|| " \
+		&& tmp_package_path="/tmp/.${new_package_filename}" \
+		&& debug_message "| define_vars − Use value (${RED}${tmp_package_path}${COLOR_DEBUG}) for tmp_package_path variable."
+	## }}}
+	## If new_package_path wasn't defined {{{
+	is_var_empty "${new_package_path-}" "|| " \
+		&& new_package_path="/tmp/${new_package_filename}" \
+		&& debug_message "| define_vars − Use value (${RED}${new_package_path}${COLOR_DEBUG}) for new_package_path variable."
+	## }}}
+	## If check_mode wasn't defined (argument) {{{
+	## Use default value
+	is_var_empty "${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 '/Candidate:/ {print $2}' | sed 's/.:\(.*\)-.*/\1/')
+			;;
+		"file" )               ## Check current version from installed .deb file
+			current_version=$(dpkg --list -- "${package_name}" | awk -v pattern="${package_name}" '$0~pattern {print $3}' | sed 's/.:\(.*\)-.*/\1/')
+			;;
+		* )                    ## 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="1.0.2"
+	#new_version="42.3.1"
+
+	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 it doesn't already exists, download the new package {{{
+		if [ ! -f "${new_package_path}" ]; then
+			debug_message "| Download .deb file from ${package_name} repository on Github to: ${new_package_path} ."
+			wget --quiet "${new_package_url}" --output-document="${new_package_path}"
+		fi
+	### }}}
+	## }}}
+	## If current version is uptodate {{{
+	else
+		debug_message "| Current version (${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}" "${new_package_path}" "${tmp_package_path}"
+		### Exit
+		debug_message "-- Test version END"
+		debug_message "--- MAIN END"
+		exit 0
+	fi
+	## }}}
+	debug_message "-- Test version END"
+
+	## Verify downloaded package {{{
+	debug_message "-- Verify downloaded package BEGIN"
+	## If the downloaded package has a size greater than zero {{{
+	if [ -s "${new_package_path}" ]; then
+		debug_message "| Downloaded package looks good."
+		### Create a temp file to monitor
+		touch -- "${new_version_file}"
+		printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for ${package_name} terminal (current : ${current_version}) : ${new_version}." >> "${new_version_file}"
+	## }}}
+	## If the size is null {{{
+	else
+		debug_message "| Empty file, don't need to go further."
+		### Ensure to remove the file to monitor
+		rm --force -- "${new_version_file}"
+
+		### Keep a record of the downloaded package because as a new release might come soon
+		mv --force -- "${new_package_path}" "${tmp_package_path}"
+	fi
+	## }}}
+	debug_message "-- Verify downloaded package END"
+	# }}}
+
+	debug_message "--- MAIN END"
+
+	# Exit
+	exit 0
+}
+# }}}
+
+# Manage arguments                                                # {{{
+# This code can't be in a function due to argument management
+
+if [ ! "${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"
+			;;
+		-f|--file|--files|-p|--package )      ## Define check_mode to file mode
+			## Define var
+			readonly check_mode="file"
+			;;
+		--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