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Shell History References
Various shells including csh and bash support "history references"
that begin with `!' and `^'. Shell mode now understands this syntax.
If you insert a history reference and type TAB, this searches the input
history for a matching command, performs substitution if necessary, and
places the result in the buffer in place of the history reference. For
example, you can fetch the most recent command beginning with `mv' with
`! m v TAB'. You could then resubmit this command to the shell by
typing RET as usual.
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