My Source Code

[sean@localhost 桌面]$ date > date.txt
[sean@localhost 桌面]$ ls
03_linux_beginning.pdf  date.txt

[sean@localhost 桌面]$ cat date.txt
五  8月  3 10:00:56 CST 2012

> file.txt 儲存訊息 覆蓋

>> 附加訊息

[sean@localhost 桌面]$ date >> date.txt
[sean@localhost 桌面]$ cat date.txt
五  8月  3 10:00:56 CST 2012
五  8月  3 10:03:04 CST 2012

true (空值)

[sean@localhost 桌面]$ true > date.txt
[sean@localhost 桌面]$ cat date.txt
[sean@localhost 桌面]$

清空登入記錄

[sean@localhost 桌面]$ sudo true /var/log/wtm