Navigating irb
From the irb prompt, if you’re not in the middle of typing a multiline expression, pressing the up arrow will move you through your command history, showing the previous command, then the one before it and so on. The down arrow will move you forward in the history once you’ve started backward. The command history is persisted between sessions.
Unlike the way your shell might be set up, the up arrow doesn’t act as a partial search. If you type a character and then press the up arrow, your typing will be replaced by the entire previous command regardless of whether the character you typed is the beginning of the previous command. By default, irb stores 1000 commands in its history, but this amount can be configured.
If you’re in ...
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