From Nagios Wiki
# ps -ef | grep nrpe
nagios 123467 1 0 Dec 19 - 0:04 /usr/bin/nrpe -c /etc/nrpe.cfg -d
root 8761428 9314336 0 16:18:28 pts/2 0:00 grep nrpe
[root:AIXbox:/home/root]
# kill -9 123467
[root:AIXbox:/home/root]
# ps -ef | grep nrpe
root 9576452 9314336 0 16:18:53 pts/2 0:00 grep nrpe
[root:AIXbox:/home/root]
# /usr/bin/nrpe -c /etc/nrpe.cfg -d
[root:AIXbox:/home/root]
# ps -ef | grep nrpe
root 9425002 9314336 0 16:19:12 pts/2 0:00 grep nrpe
nagios 9576454 1 0 16:19:09 - 0:00 /usr/bin/nrpe -c /etc/nrpe.cfg -d