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Event Designators

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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