[root@Nginx_BackUP keepalived]# ps -C nginx
  PID TTY          TIME CMD
 3965 ?        00:00:00 nginx
 3966 ?        00:00:00 nginx
 3968 ?        00:00:01 nginx
[root@Nginx_BackUP keepalived]# ps -C nginx  --no-header
 3965 ?        00:00:00 nginx
 3966 ?        00:00:00 nginx
 3968 ?        00:00:01 nginx
#-C 接命令的名称 可查PID跟pgrep 差不多
[root@Nginx_BackUP keepalived]# pgrep nginx
3965
3966
3968



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