?
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
? info po symbol
addtypes ldcmds print symtab
base load ps t
bt md px task
deftask mmap q trace
dis module q! unload
dt namelist quit version
dump nmlist report vi
findsym od s390dbf vtop
fsym offset savedump walk
h p set whatis
help page sizeof
history pb stat
id pd strace
>> ? 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.