Git标记语法:为什么有些标记带有-破折号而有些带有-2? [英] Git Flag Syntax: why do some flags have -one dash and some have --two?

问题描述

我正在学习Git，并且无法使用 查找 任何 解释 标记 语法.

I am learning Git and have been unable to find any explanation of the flag syntax.

我不是指裸双破折号"

I'm not referring to the "bare double dashes"

--

据我们所知，

表示接下来的事情不是一种选择.我指的是各种实际标志，有时带有一个破折号，有时带有两个破折号.

which, as we know, indicate that what follows is not an option. I'm referring to various actual flags which sometimes have one dash, and sometimes have two.

git log -2 -p -U1 --graph

带有一个破折号和两个破折号的标志之间有什么区别?双破折号表示什么?

What is the difference between a flag with one dash and two dashes? What does the double dash indicate?

例如，以下两个标志是相同的，(根据 ):

For example, the following two flags are identical, (according to this):

-q
--quiet

为什么破折号不同?如果我输入了错误的号码怎么办?

Why the different number of dashes? What if I put the wrong number?

推荐答案

我的理解是git遵循标志的标准" Linux约定.那就是:

My understanding is that git follows the 'standard' Linux convention for flags. That is:

• 短"标志的破折号:通常是一个字符标志，但有时带有单个字符的标志，然后是代表该标志参数的其他字符(例如，git log -SFoo，其中Foo是该标志的参数-S标志).这些标志可以是也可以不是其他较长标志的缩写形式.
• "long"标志的两个破折号:多字符标志，通常是英语单词.如果这些标志接收参数，则该标志与标志之间用=符号(例如git log --author=Peter)分隔.

• one dash for 'short' flags: generally one character flags, but sometimes flags with a single character, then further characters which represent a parameter to the flag (e.g. git log -SFoo, in which Foo is a parameter to the -S flag). These flags may or may not be abbreviated forms of other, longer flags.
• Two dashes for 'long' flags: multi-character flags which are usually an English word. If these flags receive parameters, it is separated from the flag by an = sign (e.g. git log --author=Peter).

这是为什么":这是嵌入在Linux世界中的约定. Git来自这个世界，因此遵循惯例. 长标记的两个破折号，短标记的一个破折号"规则应指导您确定标记使用多少个破折号.

This is the 'why': it is a convention which is embedded in the Linux world. Git comes from this world, so it follows the convention. The 'two dashes for a long flag, one for a short flag' rule should guide you as to how many dashes to use for a flag.

至于为什么会有重复的长和短标志，例如--quiet和-q，它只是提供助记符或简洁性的选项. --quiet更容易记住，但-q习惯于键入和进行心理分析时则更快.例如，我经常键入git commit -m "...blah"，如果每次必须输入git commit --message='...blah'来使命令长度加倍，它就会让我感到不安.

As for why there are duplicate short and long flags, such as --quiet and -q, it's just to provide the option of either mnemonic convenience or terseness. --quiet is easier to remember, but -q is quicker to type and mentally parse if you're used to it. For instance, I type git commit -m "...blah" so frequently it would get on my nerves if I had to double the length of my command every time by entering git commit --message='...blah'.

我没有遇到过任何在两个破折号和一个破折号的情况下表现不同的git标志，因此通常如果您为一个破折号标志输入两个破折号，或者反之亦然，则不会有任何无法弥补的坏处发生这种情况，git只会抱怨您的标志而无所事事.

I haven't come across any git flags which behave differently given two dashes and one dash, so generally if you enter two dashes for a one-dash flag or vice versa, nothing irreparably bad will happen, git will just complain about your flags and do nothing.

当然，git有很多命令，每个命令都有很多标志，因此所有这些规则可能都有例外.他们一般都应该持有.

Of course, git has a vast number of commands, each with a vast number of flags, so it is possible that there are exceptions to all these rules. They should generally hold though.

这篇关于Git标记语法:为什么有些标记带有-破折号而有些带有-2?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！