?
help [-w outfile] [all | command_list]
Display a description of the named functions, including syntax. The
'all' option displays help information for every command.
Example 4-7. help
>> help
? id p sizeof
base ldcmds page stat
bt livedump pb strace
deftask load pd symtab
dis md po t
dt mktrace print task
dump mmap ps trace
findsym module px unload
fsym mt q vi
h namelist q! vtop
help nmlist quit walk
history od report whatis
>> ? h
command: history [n]
Without the optional parameter, displays the current history. Optional
argument 'n' specifies the number of commands that are kept in the
history list.