vi 全文替換

比如我寫了如下的一個信件

% vi letter
------------------------------------------------------------------
Hi tom,
I think I failed my anatomy test yesterday. I had a terrible
stomach ache. I ate too many fried green tomatoes.
Anyway, Tom, I need your help. I'd like to make the test up
tomorrow, but don't know where to begin studying. Do you
think you could help me? After work, about 7 PM, come to
my place and I'll treat you to pizza in return for your help. Thanks.
                                      Your pal,
                                      guy@phantom
我覺得tom可能出去旅游了不會收到這個郵件，我還是寄給別人那么我可以這么做

% vi letter
------------------------------------------------------------------
Hi David,
I think I failed my anaDavidy test yeserday. I had a terrible
sDavidachache. I think I ate too many fried green Davidatoes.
Anyway, Tom, I need your help. I'd like to make the test up
Davidorrow, but don't know where to begin studying. Do you
think you could help me? After work, about 7 PM, come to
my place and I'll treat you to pizza in return for your help. Thanks.
                                      Your pal,
                                      guy@phanDavid

~
~
~


 :1,$s/tom/David/g

其中 1，$表示從第一行到文本結束，/tom/David/g是正規表達式，表示將tom替換為David 那么這個命令就是全文搜索tom并將其修改為David