crontab -l | { cat; echo "0 0 0 0 0 some entry"; } | crontab -
or
cat <(crontab -l) <(echo "1 2 3 4 5 scripty.sh") | crontab -
add cron
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crontab -l | { cat; echo "0 0 0 0 0 some entry"; } | crontab -
or
cat <(crontab -l) <(echo "1 2 3 4 5 scripty.sh") | crontab -