相当于 OS X 下的 tail/less --follow-name

Question

我需要尾部-f轮换的日志文件。

这是精确的与此处的问题相同，但在 OS X 上：

为什么无尾模式停止工作？

那么，在 OS X 下，如何才能持续跟踪其 inode 可能发生变化的文件？

Answer 1

来自 Ubuntu Lucid (coreutils 7.4)

   -f, --follow[={name|descriptor}]
          output appended data as the file grows; -f, --follow, and --follow=descriptor are equivalent

   With --follow (-f), tail defaults to following the file descriptor, which means that even if a tail'ed file is renamed, tail will continue to track its end.  This default behavior is not desirable when  you  really  want  to
   track  the  actual  name  of  the  file, not the file descriptor (e.g., log rotation).  Use --follow=name in that case.  That causes tail to track the named file by reopening it periodically to see if it has been removed and
   recreated by some other program

来自 Mac OS X 10.6 (10A432)

 -f      The -f option causes tail to not stop when end of file is
         reached, but rather to wait for additional data to be appended to
         the input.  The -f option is ignored if the standard input is a
         pipe, but not if it is a FIFO.

 -F      The -F option implies the -f option, but tail will also check to
         see if the file being followed has been renamed or rotated.  The
         file is closed and reopened when tail detects that the filename
         being read from has a new inode number.  The -F option is ignored
         if reading from standard input rather than a file.

假设你想要 --follow=/tmp/某物.txtLinux 上的行为，这意味着在 Mac 上你想要的是：

tail -F /tmp/somefile.txt

编辑：刚刚在 Mac OSX (Snow Leopard) 上测试过，-F将仅打开您输入的文件名，并且在移动时不会遵循其打开的文件的 inode /文件描述符。