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Command editing

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'
     Enable command line editing (enabled by default).
`set editing off'
     Disable command line editing.
`show editing'
     Show whether command line editing is enabled.