41.5.3 Shell History References
Various shells including csh and bash support history
references that begin with ‘!’ and ‘^’. Shell mode
recognizes these constructs, and can perform the history substitution
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
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.
See Shell Prompts, for how Shell mode recognizes prompts.