[root@operations ~]# ps auxf  | grep lfd
root      3030  0.0  0.0 112648   924 pts/4    S+   20:36   0:00      \_ grep --color=auto lfd
root       615  0.1  0.3 177572 27404 ?        Ss   20:32   0:00 lfd - sleeping


[root@operations ~]# zabbix_agentd -t 'proc.num[lfd]'
proc.num[lfd]                                 [u|0]