## 常用 * [x] 刪除history記錄 history命令詳細情況 ``` $ help history Options: -c clear the history list by deleting all of the entries -d offset delete the history entry at position OFFSET. -a append history lines from this session to the history file -n read all history lines not already read from the history file and append them to the history list -r read the history file and append the contents to the history list -w write the current history to the history file -p perform history expansion on each ARG and display the result without storing it in the history list -s append the ARGs to the history list as a single entry ``` * `history -c` 命令，即清除所有歷史記錄，這種比較粗暴，慎用。 * 部分刪除操作 * `vim ~/.bash_history`。該文件即為歷史記錄存儲文件，我們隨意修改 * 修改后再次 `history `查看，發現并沒有變化。原因：緩存。執行：`history -r ` * 重新打開shell * 讀取歷史文件并將其內容添加到歷史記錄中，即重置文件里的內容到內存中，完成修改！ * [x] fdsf