You can use either crontab -e <user> or a file to overwrite the crontab

Add crontab

[root@aixna001]/root# echo '* * * * * /usr/bin/perl /opt/lpar2rrd-agent/lpar2rrd-agent.pl lnxmonitor01 > /var/tmp/lpar2rrd-agent1.out 2>&1' > /tmp/cron_lpar2rrd
[root@aixna001]/root# su - lpar2rrd -c 'crontab  /tmp/cron_lpar2rrd'

[root@aixna001]/root> crontab -l lpar2rrd
0 1 * * * /usr/bin/perl /opt/lpar2rrd-agent/lpar2rrd-agent.pl lnxmonitor01 > /var/tmp/lpar2rrd-agent.out 2>&1

[root@aixna001]/root> crontab -v lpar2rrd
Crontab file: lpar2rrd     Submission time: Thu Jan 11 09:32:45 CET 2024