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You are probably falling for Cron Problem Number One (https://www.unix.com/302351513-post2.html).

I hope this helps.

bakunin

Only a $-sign away ;)
awk '$3 !~ /30120$/' infile

Worth building in a way of stopping the process.
To stop the process, delete /var/tmp/stopme

touch /var/tmp/stopme
while [ -f /var/tmp/stopme ]
do
telnet towel.blinkenlights.nl
done