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GDB reads its input commands via the readline interface. This
GNU library provides consistent behavior for programs which provide a
command line interface to the user. Advantages are GNU Emacs-style
or vi-style inline editing of commands, csh
-like history
substitution, and a storage and recall of command history across
debugging sessions.
You may control the behavior of command line editing in GDB with the
command set
.
set editing
set editing on
set editing off
show editing