教你编写bat脚本Windows批处理

@echo off

rem remarks

:: remarks

@echo off 
rem this is for listing down all the files in the directory program files 
dir "c:\program files" > c:\lists.txt 
echo "the program has completed"

rem test.bat
@echo off 
echo %1 
echo %2 
echo %3

test.bat 1 2 3

@echo off 
set message=hello world 
echo %message%
rem 变量需要包含在％符号中显示

@echo off 
set /a a=5 
set /a b=10 
set /a c=%a% + %b% 
echo %c%

@echo off 
set globalvar=5
setlocal
set var=13145
set /a var=%var% + 5
echo %var%
echo %globalvar%
endlocal

@echo off 
echo %java_home%

set message=hello world

set a= 
if [%a%]==[] echo "string a is empty" 

@echo off 
set a=hello 
set b=world 
set /a d=50 
set c=%a% and %b% %d%
echo %c%
:: hello and world 50

@echo off
set str=hello world
call :strlen str strlen
echo string is %strlen% characters long
exit /b
:strlen
setlocal enabledelayedexpansion
:strlen_loop
   if not "!%1:~%len%!"=="" set /a len+=1 & goto :strlen_loop
(endlocal & set %2=%len%)
goto :eof

@echo off
set var=13145
set /a var=%var% + 5
echo %var%

%variable:~num_chars_to_skip% 
%variable:~num_chars_to_skip,num_chars_to_keep%

@echo off 
set x=1000 
set y=1 
set y=%y% 
echo %x% 

set y=%y:~-4% 
echo %y%

@echo off 
set str=batch scripts is easy. it is really easy. 
echo %str% 
:: 删除is
set str=%str:is=% 
echo %str%
:: batch scripts easy. it really easy.

@echo off 
set str=batch scripts is easy. it is really easy 
echo %str% 

set str=%str:~1,-1% 
echo %str%
:: atch scripts is easy. it is really eas

@echo off 
set str=this string    has    a  lot  of spaces 
echo %str% 

set str=%str:=% 
echo %str%
:: thisstringhasalotofspaces

@echo off 
set str=this message needs changed. 
echo %str% 

set str=%str:needs=has% 
echo %str%
:: this message has changed.

set a[0]=1

@echo off 
set list=1 2 3 4 
(for %%a in (%list%) do ( 
   echo %%a 
))

echo %a[0]%

set a[3]=4 

@echo off 
setlocal enabledelayedexpansion 
set topic[0]=comments 
set topic[1]=variables 
set topic[2]=arrays 
set topic[3]=decision making 
set topic[4]=time and date 
set topic[5]=operators 

for /l %%n in (0,1,5) do ( 
   echo !topic[%%n]! 
)

@echo off 
set arr[0]=1 
set arr[1]=2 
set arr[2]=3 
set arr[3]=4 
set "x=0" 
:symloop 

if defined arr[%x%] ( 
   call echo %%arr[%x%]%% 
   set /a "x+=1"
   goto :symloop 
)
echo "the length of the array is" %x%

@echo off 
set len=3 
set obj[0].name=joe 
set obj[0].id=1 
set obj[1].name=mark 
set obj[1].id=2 
set obj[2].name=mohan 
set obj[2].id=3 
set i=0 
:loop 
if %i% equ %len% goto :eof 
set cur.name= 
set cur.id=
for /f "usebackq delims==.tokens=1-3" %%j in (`set obj[%i%]`) do ( 
   set cur.%%k=%%l 
) 
echo name=%cur.name% 
echo value=%cur.id% 
set /a i=%i%+1 
goto loop

if %c%==15 (echo "the value of variable c is 15") else (echo "unknown value") 

if defined str1 echo "variable str1 is defined"

if exist c:\set3.txt (echo "file exists") else (echo "file does not exist")

if errorlevel n somecommand

@echo off 
set /a a=5 

if %a%==5 goto :labela 
if %a%==10 goto :labelb
:labela 
echo "the value of a is 5" 
exit /b 0
:labelb 
echo "the value of a is 10"

echo %date%

@echo off 
echo/today is: %year%-%month%-%day% 
goto :eof 
setlocal enableextensions 
set t=2&if "%date%z" lss "a" set t=1 

for /f "skip=1 tokens=2-4 delims=(-)" %%a in ('echo/^|date') do ( 
   for /f "tokens=%t%-4 delims=.-/ " %%d in ('date/t') do ( 
      set %%a=%%d&set %%b=%%e&set %%c=%%f)) 
endlocal&set %1=%yy%&set %2=%mm%&set %3=%dd%&goto :eof

echo %time%

dir c:\ > lists.txt 2> &1

:function_name 
do_something 
exit /b 0

:display 
set /a index=2 
echo the value of index is %index% 
exit /b 0

@echo off
rem main
setlocal
call :display 5 , 10
exit /b %errorlevel%
rem function
:display
echo the value of parameter 1 is %~1
echo the value of parameter 2 is %~2
exit /b 0

:: 获取内存大于40mb的进程
tasklist /fi "memusage gt 40000"

:: 获取内存大于40mb的进程
tasklist /fi "memusage gt 40000"

start "title" [/d path] [options] "command" [parameters]

:: 杀死(终止)打开的记事本任务
taskkill /f /im notepad.exe
:: 杀死了一个id为9901的进程
taskill /pid 9901

start "title" [/d path] [options] "command" [parameters]

:: 在新窗口中运行批处理脚本test.bat。 窗口将以最小化模式启动，并且指定标题为:“test batch script”。
start "test batch script" /min test.bat
:: 在另一个进程中运行microsoft word，然后在ms word中打开文件testa.txt
start "" "c:\program files\microsoft office\winword.exe" "d:\test\testa.txt"

dw=dir /w

doskey [options] [macroname=[text]]

@echo off
doskey cd=cd/test
doskey d=dir

@echo off
doskey cd=cd/test
doskey d=dir
d=

:: 两个命令同时启动，但是sort命令暂停，直到它接收到dir命令的输出。 
:: sort命令使用dir命令的输出作为输入，然后将其输出发送到句柄1(即stdout)。
dir c:\ | sort