日期命令不遵循 Linux 规范 (Mac OS X Lion) [英] Date command does not follow Linux specifications (Mac OS X Lion)

问题描述

我已经在我的 linux 机器上开发了一个脚本很长一段时间了，我也想在我的 Mac 上运行它.

I have been developing a script on my linux box for quite some time, and wanted to run it on my Mac as well.

我以为Mac上的功能和linux上的功能是一样的，今天发现不对.我知道 Mac 上存在的功能较少，但我认为确实存在的功能具有相同的实现.

I thought that the functions on the Mac were the same as the functions on linux, but today I realized it was wrong. I knew that fewer functions existed on the Mac, but I thought that the functions that did exist, had the same implementation.

这个问题是专门针对 date 命令的.

This problem is specifically in regards to the date command.

当我在我的 linux 机器上运行带有参数以提供一些时间(以纳秒为单位)的命令时，我得到了正确的结果，但是当我在我的 mac 上运行它时，它没有那个选项.

When I run the command on my linux machine with the parameter to provide some time in nanoseconds, I get the correct result, but when I run it on my mac, it does not have that option.

Linux-Machine> date +%N
55555555555 #Current time in nanoseconds
Mac-Machine> date +%N
N

如何在 Mac 上以 bash 命令的形式获取以纳秒为单位的当前时间?

How do I go about getting the current time in nanoseconds as a bash command on the Mac?

最坏的情况是我创建了一小段代码，用 C 或其他语言调用系统函数，然后在我的脚本中调用它.

Worst case is I create a small piece of code that calls a system function in C or something and then call it within my script.

非常感谢任何帮助！

推荐答案

这是因为 OSX 和 Linux 使用两组不同的工具.Linux 使用 date 命令的 GNU 版本(因此，GNU/Linux).请记住，Linux 是 Linux，而 OS X 是 Unix.他们是不同的.

This is because OSX and Linux use two different sets of tools. Linux uses the GNU version of the date command (hence, GNU/Linux). Remember that Linux is Linux and OS X is Unix. They're different.

您可以从 date 命令coreutils/Portfile" rel="noreferrer">MacPorts.它将作为 gdate 安装在您的系统上.您可以使用它，也可以将 date 二进制文件与新的 gdate 二进制文件链接起来；您的选择.

You can install the GNU date command which is included in the "coreutils" package from MacPorts. It will be installed on your system as gdate. You can either use that, or link the date binary with the new gdate binary; your choice.

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