zsh: History Expansion

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### 14.1 History Expansion

History expansion allows you to use words from previous command lines in the command line you are typing. This simplifies spelling corrections and the repetition of complicated commands or arguments.

Immediately before execution, each command is saved in the history list, the size of which is controlled by the `HISTSIZE` parameter. The one most recent command is always retained in any case. Each saved command in the history list is called a history event and is assigned a number, beginning with 1 (one) when the shell starts up. The history number that you may see in your prompt (see Prompt Expansion) is the number that is to be assigned to the next command.