See:
SEFOS# help first_word
where first_word is the first word of the command string.
For example, to get help on the show clock command, type:
SEFOS# help show
EXEC commands :
show access-lists [[{ip | mac}] <access-list-number (1-65535)> ]
[Desc]: Display access lists configuration
show aliases
[Desc]: Displays the aliases.
show arp spoofing [interface <ifXtype> <ifnum>]
[Desc]: Shows the arp spoofing details.
...
show clock
[Desc]: Displays the system clock.
...
show wildcard {mac-address <mac_addr> | broadcast} [switch <context_name>]
[Desc]: Displays wildcard Mac Address Table entries
SEFOS#