清除Linux操作系统命令的历史记录

[root@localhost windata]# history -c 
[root@localhost windata]# history -r /root/history.txt 
[root@localhost windata]# history 
1 history -r /root/history.txt 
2 mount -t msdos -o iocharset=gb2312 /dev/sda1 /mnt/usb 
3 mount -t vfat -o iocharset-gb2312 /dev/hda5 /mnt/windata 
4 umount /mnt/windata 
5 mount -t vfat -o iocharset-gb2312 /dev/hda5 /mnt/windata 
6 cd /mnt/windata 
7 history 
[root@localhost windata]#