When I execute ps -n in centos?

I am not able understand the below process list, can anyone give a gist about it thanks.

ps -n
Warning: bad syntax, perhaps a bogus ‘-’? See /usr/share/doc/procps-3.2.8/FAQ
PID TTY STAT TIME COMMAND
1932 pts/0 Ss 0:00 -bash
1949 pts/0 R+ 0:00 ps -n
3208 tty2 Ss+ 0:00 /sbin/mingetty /dev/tty2
3210 tty3 Ss+ 0:00 /sbin/mingetty /dev/tty3
3212 tty4 Ss+ 0:00 /sbin/mingetty /dev/tty4
3213 hvc0 Ss+ 0:00 /sbin/agetty /dev/hvc0 38400 vt100-nav
3215 tty5 Ss+ 0:00 /sbin/mingetty /dev/tty5
3220 tty6 Ss+ 0:00 /sbin/mingetty /dev/tty6
7686 pts/1 Ss 0:00 bash

Hope these info helps:

   -n namelist     set namelist file. Identical to N.
                   The namelist file is needed for a proper WCHAN display, and must match the current Linux kernel exactly for correct output. Without this option, the default search path for the namelist is:

                        $PS_SYSMAP
                        $PS_SYSTEM_MAP
                        /proc/*/wchan
                        /boot/System.map-`uname -r`
                        /boot/System.map
                        /lib/modules/`uname -r`/System.map
                        /usr/src/linux/System.map
                        /System.map

   n               Numeric output for WCHAN and USER. (including all types of UID and GID)

nwchan WCHAN address of the kernel function where the process
is sleeping (use wchan if you want the kernel
function name). Running tasks will display a
dash (’-’) in this column.

wchan WCHAN name of the kernel function in which the process
is sleeping, a “-” if the process is running, or
a “*” if the process is multi-threaded and ps is
not displaying threads.