vim delete mutiple lines (刪除多行)

delete everything from line a to line b 
:a, b de

ex: 
:1,10 de

vim delete empty line (刪除空白行)

delete those lines which have no content :

:g/^$/d

delete those lines which are only composed of "space":

:g/^\s*$/d

delete those lines which are composed of "space or tab":

:g/^[ |\t]*$/d

刪除沒有內容的空行
:g/^$/d

刪除包含有空格組成的空行
:g/^\s*$/d

除以空格或tab開頭到結尾的空行
:g/^[ |\t]*$/d

From http://blog.cmchen.net/2006/12/25/325/

remove weird symbols in vim (刪除奇怪字元)

From http://deepupc.wordpress.com/2009/10/28/removing-special-charactersmca-in-vi/

to remove character such as ^M, ^K,...

In vi, do a :%s/^M//g

To get the ^M hold the control key, press V then M (Both while holding the control key) and the ^M will appear. This will find all occurances and replace them with nothing.

vim 縮排

在 VIM 中撰寫程式，可以利用「gg」指令將游標移到視窗最上方、利用「v」切換到選取模式、再用「G」將游標移到檔案尾端 (即達到全選的功能)，最後按「=」，VIM 便會幫你的程式做自動對齊

另外也可在選取後按

Shift+< : 將選取的程式碼往左縮排一次

Shift+> : 將選取的程式碼往右縮排一次

或是按一個數字後再按Shift+< , 就可做指定次數的縮排

Reference: http://homepage.ttu.edu.tw/u9106240/page_main/vim_menu.html