GVim视觉模式中的奇怪角色

Question

When I enter visual mode (from normal mode), and when then I press : there are these characters: <,'> after the :

They are a feature or a bug?

Windows XP SP2

alt text http://img94.imageshack.us/img94/5590/16595366.jpg

Answer 1

您选择了可视范围，当您输入:在这种情况下，则会自动添加所选范围说明符'<,'>以指示该命令仅应用于选择。

Answer 2

In vi[m], you can apply : commands (ex-commands) on the current line (default), or any other line, or more generally, a range of lines. The range is denoted as start,end . For example, do delete the current line, you can do:

:d

To delete three lines in the range (current-1) to (current+1):

:-1,+1d

In vim , marks < and > are used to denote the current selection (or the last selection if nothing is selected). So, when you type a : in visual mode, vim is smart enough to realize that you might want to apply the command only to the selected region, so gives you the range after the : . You just type your command and the results apply only to the selection. (Well, the range defined by lines in the selection, to be precise.)

That means that you can actually move to the lines containing the beginning and the end of the last selected region by typing '< and '> respectively. Replace ' with ` (backtick) to the beginning/end of the selection.

Answer 3

This is of course not a bug. It is the range modifier that can precede commands, in this case it means the visually highlighted range.

Type

:h cmdline-ranges

to learn more about ranges.

Answer 4

它们是范围的正常指示。

Answer 5

'<,'> is your visually selected area. Think about it, its easy to represent ranges if you know numbers, but for a visually selected text the only way to represent them (write/type it down) would be to use specialized symbols, and in this case '<,'>

What more, you can do commands on the visually selected area the same way you'd do commands over a range of line numbers

1,200 s/old/new/c

'<,'> s/old/new/c