gdb.info: Event Designators

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Event Designators

An event designator is a reference to a command line entry in the
history list.
`!'
     Start a history substitution, except when followed by a space, tab,
     the end of the line, `=' or `('.
`!N'
     Refer to command line N.
`!-N'
     Refer to the command N lines back.
`!!'
     Refer to the previous command.  This is a synonym for `!-1'.
`!STRING'
     Refer to the most recent command starting with STRING.
`!?STRING[?]'
     Refer to the most recent command containing STRING.  The trailing
     `?' may be omitted if the STRING is followed immediately by a
     newline.
`^STRING1^STRING2^'
     Quick Substitution.  Repeat the last command, replacing STRING1
     with STRING2.  Equivalent to `!!:s/STRING1/STRING2/'.
`!#'
     The entire command line typed so far.