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I noticed that if I run the script in the crontab every 10min it updates the zone every time, even though the IP addresses are the same. I then sat down and saw that it apparently tries to compare two strings or a string and a number and then it thinks the IP is not the same and therefore executes an nsupdate. I fixed the whole thing by running the IP and OLDIP in a subshell and adding an xargs to both. I removed the awk and since then the script recognises that both IP addresses are the same.
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I noticed that if I run the script in the crontab every 10min it updates the zone every time, even though the IP addresses are the same. I then sat down and saw that it apparently tries to compare two strings or a string and a number and then it thinks the IP is not the same and therefore executes an nsupdate. I fixed the whole thing by running the IP and OLDIP in a subshell and adding an xargs to both. I removed the awk and since then the script recognises that both IP addresses are the same.