语句结构2练习

1、无开关

@echo off
for %%i in  (a,b,c,d) do  echo %%i
pause

以下这段代码的 功能是 ：检测当前硬盘都有哪些分区
@echo off 
set str=c d e f g h i j k l m n o p q r s t u v w x y z 
echo  当前硬盘的分区有： 
for %%i in (%str%) do if exist %%i: echo %%i: 
pause 

想知道当前目录下都有哪些文件，请用下面的代码： 
 @echo off 
for %%i in (*.*) do echo "%%i" 
pause 

 想列出当前目录下所有的文本文件
@echo off 
for %%i in (*.txt) do echo "%%i" 
pause 

2、含开关l

@echo  off
for /l %%i in (1,2,10) do echo  %%i
pause

 3、含开关f

为解析文本而生：for /f  的基本用法

@echo off 
for /f %%i in (test.txt) do echo %%i 
pause 

@echo off 
for /f %%i in (123.txt) do echo %%i&pause
pause 

 切分字符串的利器：delims= 

@echo off 
for /f "delims=，" %%i in (test.txt) do echo %%i 
pause 

定点提取：tokens=

@echo off 
for /f "delims=，  tokens=3" %%i in (test.txt) do echo %%i 
pause 

@echo off 
for /f "delims=，  tokens=2,5" %%i in (test.txt) do echo %%i %%j 
pause 

@echo off 
for  /f  "delims= ，   tokens=1,2,3,4,5"  %%i  in  (test.txt)  do 
echo %%i %%j %%k %%l %%m 
pause 

tokens=1,2,3,4,5  可以简写为  tokens=1-5 

跳过无关内容，直奔主题：skip=n

@echo off 
for /f "skip=2" %%i in (test.txt) do echo %%i   //这段代码将跳过头两行内容，从第3 行起显示test.txt 中的信息。
pause 

忽略以指定字符打头的行：eol=

FOR /F "eol=; tokens=2,3* delims=, " %i in (myfile.txt) do @echo %i %j %k //会分析  myfile.txt  中的每一行，忽略以分号打头的那些行„„ 

https://blog.csdn.net/wh_19910525/article/details/7912440