If you want to execute the previous command again, you can match the previous command by pressing `Up/↑` or `Ddown/↓` when you enter halfway. For example, if `sysenv USER` was executed before, then after entering `sysenv US`, you can type `Up/↑`, and it will be automatically completed as `sysenv USER`. If you want to see all the history commands, you can also view them with the `history`{{execute T2}} command.