Reverse logic

src/freedombone-app-gnusocial

     sed -i '/gnusocial/d' $COMPLETION_FILE
     remove_backup_database_local gnusocial
 
-    sed -i '/gnusocial-firewall/d' /etc/crontab
+    if grep -q 'gnusocial-firewall' /etc/crontab; then
+        sed -i '/gnusocial-firewall/d' /etc/crontab
+    fi
 
     function_check remove_ddns_domain
     remove_ddns_domain $GNUSOCIAL_DOMAIN_NAME

src/freedombone-app-koel

     drop_database koel
     function_check remove_onion_service
     remove_onion_service koel ${KOEL_ONION_PORT}
-    if grep -q "koel" /etc/crontab; then
-        sed -i "/koel/d" /etc/crontab
-    fi
     remove_app koel
     remove_completion_param install_koel
     sed -i '/koel/d' $COMPLETION_FILE
     remove_backup_database_local koel
 
-    sed -i '/koel-firewall/d' /etc/crontab
-
     function_check remove_ddns_domain
     remove_ddns_domain $KOEL_DOMAIN_NAME
 }

src/freedombone-app-nextcloud

     drop_database nextcloud
     function_check remove_onion_service
     remove_onion_service nextcloud ${NEXTCLOUD_ONION_PORT}
-    if grep -q "nextcloud" /etc/crontab; then
-        sed -i "/nextcloud/d" /etc/crontab
-    fi
     remove_app nextcloud
     remove_completion_param install_nextcloud
     sed -i '/nextcloud/d' $COMPLETION_FILE

src/freedombone-logging

 }
 
 function turn_off_rsys_logging {
-    if grep -q '/var/log/auth.log' /etc/rsyslog.conf; then
+    if ! grep -q '/var/log/auth.log' /etc/rsyslog.conf; then
         return
     fi
     sed -i 's|mail,news.none.*|mail,news.none      /dev/null|g' /etc/rsyslog.conf
 }
 
 function turn_on_rsys_logging {
-    if ! grep -q '/var/log/auth.log' /etc/rsyslog.conf; then
+    if grep -q '/var/log/auth.log' /etc/rsyslog.conf; then
         return
     fi
     sed -i 's|mail,news.none.*|mail,news.none      -/var/log/messages|g' /etc/rsyslog.conf