improved

set-minutely-crontab-job.sh

@@ -1,6 +1,15 @@
 #!/bin/sh
-sudo su -
+#sudo su -
 # NOTE: this works only since user is a field on Ubuntu (on some GNU/Linux systems it is not, which is implied by omission at http://www.adminschoice.com/crontab-quick-reference)
 # Minute, Hour, Day of Month, Month (1 to 12), Day of Week
 # m h dom mon dow user command
-echo "* * * * * root /home/owner/minetest/util/chunkymap-cronjob" >> /etc/crontab
+cd ~
+MT_CHUNKYMAP_CRON_TMP=mts_cron.tmp
+if [! -f "crontab.1st"];
+then
+sudo cp /etc/crontab "crontab.1st"
+fi
+crontab -l > "$MT_CHUNKYMAP_CRON_TMP"
+echo "* * * * * root /home/owner/minetest/util/chunkymap-cronjob" >> "$MT_CHUNKYMAP_CRON_TMP"
+sudo crontab "$MT_CHUNKYMAP_CRON_TMP"
+rm "$MT_CHUNKYMAP_CRON_TMP"