[root@node1 nginx]# ps -ef | grep nginx
root       25420       1  0 11:39 ?        00:00:00 nginx: master process /usr/sbin/nginx
nginx      25421   25420  0 11:39 ?        00:00:00 nginx: worker process
nginx      25422   25420  0 11:39 ?        00:00:00 nginx: worker process
nginx      25423   25420  0 11:39 ?        00:00:00 nginx: worker process
nginx      25424   25420  0 11:39 ?        00:00:00 nginx: worker process
root       27519    3778  0 11:49 pts/1    00:00:00 grep --color=auto nginx