set history filename fname
GDBHISTFILE, or to
./.gdb_history (./_gdb_history on MS-DOS) if this variable
is not set.
set history save
set history save on
set history filename command. By default, this option is disabled.
set history save off
set history size size
HISTSIZE, or to 256 if this variable is not set.
History expansion assigns special meaning to the character !.
Since ! is also the logical not operator in C, history expansion
is off by default. If you decide to enable history expansion with the
set history expansion on command, you may sometimes need to
follow ! (when it is used as logical not, in an expression) with
a space or a tab to prevent it from being expanded. The readline
history facilities do not attempt substitution on the strings
!= and !(, even when history expansion is enabled.
The commands to control history expansion are:
set history expansion on
set history expansion
set history expansion off
The readline code comes with more complete documentation of
editing and history expansion features. Users unfamiliar with GNU Emacs
or vi may wish to read it.
show history
show history filename
show history save
show history size
show history expansion
show history by itself displays all four states.
show commands
show commands n
show commands +