An event designator is a reference to a command-line entry in the history
list. In the list below, remember that the initial `!'
in each item
may be changed to another character by setting the histchars
parameter.
!
Start a history expansion, except when followed by a blank, newline,
‘=
’ or ‘(
’. If followed immediately by a word designator
(Word Designators), this forms a history reference
with no event designator (Overview).
!!
Refer to the previous command. By itself, this expansion repeats the previous command.
!
nRefer to command-line n.
!-
nRefer to the current command-line minus n.
!
strRefer to the most recent command starting with str.
!?
str[?
]Refer to the most recent command containing str. The trailing
‘?
’ is necessary if this reference is to be followed by a modifier or
followed by any text that is not to be considered part of str.
!#
Refer to the current command line typed in so far. The line is
treated as if it were complete up to and including the word before the
one with the ‘!#
’ reference.
!{
...}
Insulate a history reference from adjacent characters (if necessary).