没有必要把事情复杂化。在-m "文本之后…下一行是通过按Enter得到的。当按下回车键时，出现>。当你完成后，只需输入“”并按Enter:

$ git commit -m "Another way of demonstrating multicommit messages:
>
> This is a new line written
> This is another new line written
> This one is really awesome too and we can continue doing so till ..."

$ git log -1
commit 5474e383f2eda610be6211d8697ed1503400ee42 (HEAD -> test2)
Author: ************** <*********@gmail.com>
Date:   Mon Oct 9 13:30:26 2017 +0200

Another way of demonstrating multicommit messages:

This is a new line written
This is another new line written
This one is really awesome too and we can continue doing so till ...

(编辑05-05-2021)

对于Windows用户，请使用GitBash For Windows。内置的Windows cmd不适用此方法。

如果你只是想要一个标题行和一个内容行，你可以使用:

git commit -m "My head line" -m "My content line."

注意，这会创建单独的段落，而不是行。所以在每两个-m行之间会有一个空行，例如:

My head line

My content line.

没有必要把事情复杂化。在-m "文本之后…下一行是通过按Enter得到的。当按下回车键时，出现>。当你完成后，只需输入“”并按Enter:

$ git commit -m "Another way of demonstrating multicommit messages:
>
> This is a new line written
> This is another new line written
> This one is really awesome too and we can continue doing so till ..."

$ git log -1
commit 5474e383f2eda610be6211d8697ed1503400ee42 (HEAD -> test2)
Author: ************** <*********@gmail.com>
Date:   Mon Oct 9 13:30:26 2017 +0200

Another way of demonstrating multicommit messages:

This is a new line written
This is another new line written
This one is really awesome too and we can continue doing so till ...

(编辑05-05-2021)

对于Windows用户，请使用GitBash For Windows。内置的Windows cmd不适用此方法。

在Git提交中添加换行符

尝试以下命令创建多行提交消息:

git commit -m "Demonstrate multi-line commit message in Powershell" -m "Add a title to your commit after -m enclosed in quotes,
then add the body of your comment after a second -m.
Press ENTER before closing the quotes to add a line break.
Repeat as needed.
Then close the quotes and hit ENTER twice to apply the commit."

然后验证你做了什么:

git log -1

你应该得到这样的结果:

截图来自我使用PowerShell和Poshgit创建的一个示例。

这适用于所有终端和操作系统AFAIK。

下面是bash的示例:

导致这个提交:

从命令行使用Git和Bash，你可以做到以下几点:

git commit -m "this is
> a line
> with new lines
> maybe"

当你想要新的一行时，只需输入并按Enter，“>”符号意味着你已经按了Enter，并且有一个新的行。其他答案也适用。

在Bash/Zsh中，你可以简单地在引号内使用文字换行:

git commit -m 'Multi-line
commit
message'

ANSI-C引用也适用于Bash/Zsh:

git commit -m $' multiline \ncommit\nmessage'

您还可以指示Git使用您选择的编辑器来编辑提交消息。来自git-commit的文档:

用于编辑提交日志消息的编辑器将从 GIT_EDITOR环境变量，核心。编辑器配置 变量、VISUAL环境变量或编辑器 环境变量(按此顺序)。详见git-var。

因此，使用nano编辑您的消息，例如，您可以运行:

export GIT_EDITOR=nano
git commit