set | The readline interface uses the .inputrc file to |
| control the settings. |
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 below. This file defaults |
| to the value of the environment variable |
| GDBHISTFILE, or to ./.gdb_history (./ |
| _gdb_history on |
| 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 o 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 | Enable history expansion. History expansion is |
expansion | o by default. |
set history expansion off | Disable history expansion. |
show history, show history filename, show history save, show history size, show 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.
These commands display the state of the GDB history parameters. show history by itself displays all four states.
282 Controlling GDB