There are two ways to display the lines in a file in reverse order: tac (the reverse of cat) and the command tail -r.
有两种方法可以逆序显示文件中的行：tac(将cat反过来)和tail - r命令。
In Listing 6, the first command loads the function, the second command gets the head (or first) element, and the third command gets the head of the tail (or second element).
在清单6中，第一个命令装入函数，第二个得到头(或第一个)元素，第三个命令得到末尾的头(或第二个)元素。
Usually, both tasks require oodles of Windows tiled on screen to keep a watchful eye-perhaps tail in one window, less in another window, and a command prompt in yet another.
这些任务常常需要在屏幕上显示许多窗口；例如，在一个窗口中执行tail，在另一个窗口中执行less，在第三个窗口中显示命令提示。
When executed as tail filename, the tail command exits after displaying the last lines from the specified file, which isn't all that helpful when you want to monitor updates to a log file.
在执行tailfilename时，tail命令显示指定的文件中最新的几行，然后退出。这对于监视日志文件更新帮助不大。
The tail command has another handy option, -f (follow).
tail命令还有一个有用的选项-f (follow)。
As soon as the channel is opened, we execute a custom command — in this case, a tail -f on the Weblog file whose name is specified on the command line.
通道一旦打开，我们就执行一条定制的命令——本例中是Weblog文件中的一条tail - f命令，其名称在命令行中指定。
To stop the tail -f command, use Ctrl + C to break the processing.
要停止tail-f命令，使用Ctrl +C来中止进程。
She command fish in the water to swim, and its tail with rhythm, the flapping of the water.
她指挥小鱼在水中游来游去，并用自己的尾巴有节奏地拍打着水面。
She command fish in the water to swim, and its tail with rhythm, the flapping of the water.
她指挥小鱼在水中游来游去，并用自己的尾巴有节奏地拍打着水面。
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