Alleen output bij updates

apt-update.sh

@@ -1,14 +1,30 @@
 #!/bin/bash
-apt-get -qq update
-listUpgrades=$(apt list --upgradable |grep upgradable |cut -d/ -f1)
 
+# Stil stdout/stderr behalve bij echte actie
+exec 3>&1 4>&2
+
+# Systeem bijwerken
+apt-get -qq update
+
+# Upgradable packages ophalen (alleen namen)
+listUpgrades=$(apt list --upgradable 2>/dev/null | grep -F '[upgradable from:' | cut -d/ -f1)
+
+# Als er GEEN upgrades zijn, netjes afsluiten
+if [ -z "$listUpgrades" ]; then
+    exit 0
+fi
+
+# Anders: upgrades uitvoeren en output tonen (zodat cron mailt)
+echo "De volgende pakketten worden bijgewerkt:"
 echo "$listUpgrades"
 echo "=============================="
 
-execUpgrades="DEBIAN_FRONTEND=noninteractive apt-get --yes --assume-yes -o DPkg::options::=\"--force-confdef\" -o DPkg::options::=\"--force-confold\" --only-upgrade -qq install "$listUpgrades
+# Upgrade uitvoeren
-eval $execUpgrades
+DEBIAN_FRONTEND=noninteractive apt-get --yes --assume-yes \
-
+  -o DPkg::options::="--force-confdef" \
-# https://www.bggofurther.com/2018/07/automate-apt-update-and-keep-current-config-files/
+  -o DPkg::options::="--force-confold" \
+  --only-upgrade -qq install $listUpgrades
 
+# Opruimen
 DEBIAN_FRONTEND=noninteractive apt-get --yes -qq autoremove
 DEBIAN_FRONTEND=noninteractive apt-get -qq clean