Getting "pidof[29146]: invalid options on command line!" error while checking nfs service status

Issue

• Getting "pidof[29146]: invalid options on command line!" error while checking nfs service status

[root@localhost ~]# service nfs status
rpc.mountd (pid 3864) is running...
pidof: invalid options on command line!

pidof: invalid options on command line!

-l is stopped

• The expected output is:

[root@localhost ~]# service nfs status
rpc.mountd (pid 22049) is running...
nfsd (pid 22046 22045 22044 22043 22042 22041 22040 22039) is running...
rpc.rquotad (pid 22020) is running...