gdb.info: Word Designators

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Word Designators

Word designators are used to select desired words from the event.  A
`:' separates the event specification from the word designator.  It may
be omitted if the word designator begins with a `^', `$', `*', `-', or
`%'.  Words are numbered from the beginning of the line, with the first
word being denoted by 0 (zero).  Words are inserted into the current
line separated by single spaces.
   For example,
`!!'
     designates the preceding command.  When you type this, the
     preceding command is repeated in toto.
`!!:$'
     designates the last argument of the preceding command.  This may be
     shortened to `!$'.
`!fi:2'
     designates the second argument of the most recent command starting
     with the letters `fi'.
   Here are the word designators:
`0 (zero)'
     The `0'th word.  For many applications, this is the command word.
`N'
     The Nth word.
`^'
     The first argument; that is, word 1.
`$'
     The last argument.
`%'
     The word matched by the most recent `?STRING?' search.
`X-Y'
     A range of words; `-Y' abbreviates `0-Y'.
`*'
     All of the words, except the `0'th.  This is a synonym for `1-$'.
     It is not an error to use `*' if there is just one word in the
     event; the empty string is returned in that case.
`X*'
     Abbreviates `X-$'
`X-'
     Abbreviates `X-$' like `X*', but omits the last word.
   If a word designator is supplied without an event specification, the
previous command is used as the event.