? 
cable_diag ports 
clear 
clear arptable 
clear counters 
clear dos_prevention counters 
clear fdb 
clear flood_fdb 
clear igmp_snooping data_driven_group 
clear log 
clear port_security_entry port 
config 802.1p default_priority 
config 802.1p user_priority 
config 802.1x auth_mode 
config 802.1x auth_parameter ports 
config 802.1x auth_protocol 
config 802.1x capability ports 
config 802.1x guest_vlan ports 
config 802.1x init 
config 802.1x reauth 
config access_profile profile_id 
Figure 2 - 2.  The ? Command 
When users enter a command without its required parameters, the CLI will prompt users with Next possible completions: 
message. 
DES-1228/ME:5#config account 
Command: config account 
 
Next possible completions: 
<username> 
 
DES-1228/ME:5# 
Figure 2 - 3.  Example Command Parameter Help 
In this case, the command config account was entered without the parameter <username>. The CLI will then prompt users to enter 
the <username> with the message, Next possible completions:. Every command in the CLI has this feature, and complex 
commands have several layers of parameter prompting. 
In addition, after typing any given command plus one space, users can see all of the next possible sub-commands, in sequential 
order, by repeatedly pressing the Tab key. 
To re-enter the previous command at the command prompt, press the up arrow cursor key. The previous command will appear at 
the command prompt.