以與 format=flowed 兼容的方式包裝電子郵件文本，例如使用 par

我想使用命令行程序將電子郵件文本包裝成 72 個字元（以便重新格式化可以與vim. 報價使用>需要很好地處理。

超過 72 個字元的行應換行，短於 72 個字元並以空格結尾的行也應換行。不以空格結尾的行應該單獨放置，以便您可以編寫類似的內容

Best wishes,
Greg

（後面沒有空格Best wishes,）沒有被包裹成一行。

在換行的地方，應在末尾留一個尾隨空格，以便在使用format=flowed Content-Type標題發送電子郵件時，電子郵件客戶端可以正確顯示。

這是一些範例文本：

This is an example text file that I would like to reformat using par. I would like this paragraph wrapped to 72 characters because at the moment it's just one long line of text.

> This paragraph should also be wrapped 
> to 72 characters because each line 
> except the last ends with a space. 
> The quotes should be handled nicely.

These lines shouldn't be wrapped
because they are shorter than 72 chars
and don't have any trailing spaces.

par w72q（下面的輸出）接近，但不會在行尾留下尾隨空格，並且會在沒有尾隨空格的情況下換行：

This is an example text file that I would like to reformat using par. I
would like this paragraph wrapped to 72 characters because at the moment
it's just one long line of text.

> This paragraph should also be wrapped to 72 characters because each
> line except the last ends with a space. The quotes should be handled
> nicely.

These lines shouldn't be wrapped because they are shorter than 72 chars
and don't have any trailing spaces.

Vim 實際上很好地處理了這一點，而無需求助於其他程序。以下選項很有用：

setlocal comments=n:>
setlocal formatoptions+=aw
setlocal textwidth=72

請參閱:help format-comments和:help fo-table了解更多資訊。

引用自：https://unix.stackexchange.com/questions/387123