You can search for and preview a command from the history list without having to re-run it.
You can also list commands from the history list using the fc (fix command) command.
To...                                                Do this
                                                     EMACS
Preview previous command in this list                ^P
Preview next command in the list                     ^N
Search backward up the command history               ^Rstring
Search forward down the command history              ^Sstring
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