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An event designator is a reference to a command line entry in the
history list.
!
- Start a history subsititution, except when followed by a space, tab, or
the end of the line... = or (.
!!
- Refer to the previous command. This is a synonym for
!-1.
!n
- Refer to command line n.
!-n
- Refer to the command line n lines back.
!string
- Refer to the most recent command starting with string.
!?string[?]
- Refer to the most recent command containing string.
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