duckdns improved

tools/duckdns/install.sh

@@ -1,22 +1,9 @@
 #!/bin/bash
+thisdir="$( dirname "$(readlink -e -- "${BASH_SOURCE[0]}")")"
 
 # https://www.duckdns.org/install.jsp
 
-thisdir="$( dirname "$(readlink -e -- "${BASH_SOURCE[0]}")")"
-
+croncmd="$thisdir/update.sh"
+cronjob="*/30 * * * * $croncmd" # every 30 min
+( crontab -l | grep -v -F "$croncmd" ; echo "$cronjob" ) | crontab -
 cp -f "$thisdir/.env.example" "$thisdir/.env"
-
-cat <<EOF | sudo tee /etc/cron.d/duckdns && crontab -u "$(whoami)" /etc/cron.d/duckdns
-# ------------- Minute (0 - 59)
-# | ----------- Hour (0 - 23)
-# | | --------- Day of month (1 - 31)
-# | | | ------- Month (1 - 12)
-# | | | | ----- Day of week (0 - 7) (Sunday=0 or 7)
-# | | | | |
-# * * * * * "command to be executed"
-
-# AAA обновление duckdns ip
-0 * * * * $thisdir/update.sh
-
-EOF
-