unix中tail -f和tailf有什么区别？

Question

我尝试显示文本文件的尾部。如果文件很小，则没有区别。但是，如果文件太大（〜5 gB），tailf不响应。另一方面尾-f工作正常。他们之间有什么不同？

Answer 1

从手册页：

tailf will print out the last 10 lines of a file and then wait for the 
    file to grow. It is similar to tail -f but does not access the file 
    when it is not growing. This has the side effect of not updating the 
    access time for the file, so a filesystem flush does not occur periodi- 
    cally when no log activity is happening. 

http://linuxcommand.org/man_pages/tailf1.html

如果doensn't访问该文件，直接将有非常拉赫文件的一些困难，这取决于你的机器安装。