GDB can keep track of the
commands you type during your debugging sessions, so that you can be certain
of precisely what happened. Use the following commands to manage the GDB
command history facility.
- set history filename
fname
- Set the name of the GDB
command history file to fname.
This is the file where GDB reads an initial command history list, and where
it writes the command history from this session when it exits. You can
access this list through history expansion or through the history command
editing characters listed in the following. This file defaults to the value
of the environment variable, GDBHISTFILE,
or to ./.gdb_history
if this variable is not set.
set history save
set history save on
- Record command history in
a file, whose name may be specified with the set
history filename
command. By default, this option is disabled.
set history save off
- Stop recording command history
in a file.
set history size size
- Set the number of commands
which GDB keeps in its history list. This defaults to the value of the
environment variable 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 the following.
set history expansion on
set history expansion
- Enable history expansion.
History expansion is off by default.
set history expansion off
- Disable history expansion.
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
- These commands display the
state of the GDB history parameters. show
history by itself
displays all four states.
show commands
- Display the last ten commands
in the command history.
show commands n
- Print ten commands centered
on command number, n.
show commands +
- Print ten commands just
after the commands last printed.
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