diff --git a/docker/check.sharelatex.update b/docker/check.sharelatex.update
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+#!/bin/sh
+# Purpose {{{
+## Create a temp file (to monitor) if an upgrade is available for Sharelatex
+## image on the Docker Hub.
+## How-to use {{{
+### 1. Needs imagetags script, in the same directory
+### cf. https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/docker/imagetags
+# wget https://git.ipr.univ-rennes1.fr/cellinfo/scripts/raw/master/docker/imagetags
+### 2. Ensure to run with a user member of the docker group.
+### 3. Create a cron job, eg.
+#00 20 * * * root /opt/repos/ipr.scripts/docker/check.sharelatex.update
+### 4. Monitor the temp file.
+# Or enable MAILTO in cronjob and print a message in the script.
+# Or send a mail.
+# …
+## }}}
+# }}}
+
+# Vars {{{
+DEBUG=1
+
+script_wd=$(dirname "${0}")
+
+sharelatex_repo_name="sharelatex"
+sharelatex_image_name="sharelatex"
+
+#sharelatex_current_version=$(docker container ls | grep -- "${sharelatex_repo_name}/${sharelatex_image_name}" | sed -- "s/.*${sharelatex_repo_name}\/${sharelatex_image_name}:\([^ ]*\) .*/\1/")
+sharelatex_current_version="v1.2.1"
+
+sharelatex_grep_pattern="v[[:digit:]]\\.\\+[[:digit:]]*\\.\\?[[:digit:]]*$"
+sharelatex_new_version=$("${script_wd}"/imagetags "${sharelatex_repo_name}/${sharelatex_image_name}" "${sharelatex_grep_pattern}" | tail -n1)
+
+sharelatex_new_version_file="/tmp/.docker.sharelatex.upgrade"
+# }}}
+
+# Check if a container already runs with the wanted image {{{
+#if [ ! $(docker container ls | grep -q -- "${sharelatex_repo_name}${sharelatex_image_name}") ]; then
+	#[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test ${sharelatex_image_name} — Current version is ${sharelatex_current_version}."
+#else
+	#[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test ${sharelatex_image_name} — No container runs with ${sharelatex_image_name} image on this host."
+	#rm -f -- "${sharelatex_new_version_file}"
+	#exit 1
+#fi
+
+## I am currently using a homemade version of Sharelatex in order to :
+##	* use the last version of LaTeX/tlmgr env (2018)
+##	* add severals packages used for Physics papers
+## For more informations, see :
+## https://github.com/ipr-cnrs/sharelatex-docker-image
+
+# }}}
+
+# Check if the current version is the last one {{{
+if [ "${sharelatex_current_version}" != "${sharelatex_new_version}" ]; then
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — An upgrade is available for ${sharelatex_image_name}: ${sharelatex_new_version}."
+	# Create a temp file to monitor
+	touch -- "${sharelatex_new_version_file}"
+	printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for ${sharelatex_image_name}: ${sharelatex_new_version}." >> "${sharelatex_new_version_file}"
+else
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — The current version is up-to-date."
+	rm -f -- "${sharelatex_new_version_file}"
+fi
+# }}}
+
+exit 0