history is the maximum number of entries held in the command line/read line recall buffer.
Changing This Parameter
On the Advanced Memory page of the Management Portal (System Administration > Configuration > Additional Settings > Advanced Memory), edit the values for history.
Instead of using the Management Portal, you can change history in the Config.configOpens in a new tab class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).
This setting does not require a restart to take effect.