vim：替换指令

全文替换：
 

在命令模式下：

:%s/old/new/g

将全部的old替换成new

:s/old/new

将光标所在行的第一个old替换为new

:s/old/new/g 

将光标所在行的所有old替换为new

 参数g就是global，全局替换

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参考：

 Lesson 4.4: THE SUBSTITUTE COMMAND

        ** Type  :s/old/new/g  to substitute 'new' for 'old'. **

  1. Move the cursor to the line below marked --->.

  2. Type  :s/thee/the <ENTER> .  Note that this command only changes the
     first occurrence of "thee" in the line.

  3. Now type  :s/thee/the/g .  Adding the  g  flag means to substitute
     globally in the line, change all occurrences of "thee" in the line.

---> thee best time to see thee flowers is in thee spring.

  4. To change every occurrence of a character string between two lines,
     type   :#,#s/old/new/g    where #,# are the line numbers of the range
                               of lines where the substitution is to be done.
     Type   :%s/old/new/g      to change every occurrence in the whole file.
     Type   :%s/old/new/gc     to find every occurrence in the whole file,
                               with a prompt whether to substitute or not.