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Various shells including csh and bash support history references that begin with `!' and `^'. Shell mode recognizes these constructs, and can perform the history substitution for you.
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 can edit the command if you wish, and then resubmit the command to the shell by typing RET.
Shell mode can optionally expand history references in the buffer
when you send them to the shell. To request this, set the variable
input. You can make
SPC perform history expansion by binding SPC to the
Shell mode recognizes history references when they follow a prompt.
Normally, any text output by a program at the beginning of an input
line is considered a prompt. However, if the variable
comint-use-prompt-regexp-instead-of-fields is non-
then Comint mode uses a regular expression to recognize prompts. In
general, the variable
comint-prompt-regexp specifies the
regular expression; Shell mode uses the variable
shell-prompt-pattern to set up
the shell buffer.
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