您可以在终端中使用tac命令吗？ [英] Can you use the tac command in Terminal?

问题描述

我正在尝试从命令行（使用终端）以相反的顺序搜索大文件。我找到了tac命令： http://clifgriffin.com/2008/ 11/25 / tac-and-reverse-grep /

I'm trying to search a large file in reverse order from the command line (using terminal). I found the tac command: http://clifgriffin.com/2008/11/25/tac-and-reverse-grep/

tac是cat的倒数。但是，当我尝试在终端中使用tac命令时，它说该命令不存在。有什么方法可以在终端中使用tac？还有哪些其他快速方法可以通过命令行从头开始搜索文件？

tac is the inverse of cat. However, when I try to use the tac command in terminal, it says that command doesn't exist. Is there a way I'd be able to use tac in terminal? What are some other fast ways to search a file from the end via the command line?

推荐答案

MacOS版本的 tail 支持 -r （反向）选项，默认
从头开始显示整个文件。因此， tail -r文件名应该与
完全等效于 tac文件名。

The MacOs version of tail support the -r ("reverse") option, and defaults to displaying the entire file from the end. So tail -r filename should be exactly equivalent to tac filename.

或者，您可以尝试从源代码自己构建tac。它是GNU coreutils 程序包的一部分。

Or, you could try building tac yourself from the source code. It's part of the GNU coreutils package.

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