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a.txt 　
代碼:

[Promise don't come easy]
I should have known all along.
There was something wrong.
I just never read between the lines.
Then I woke up one day and found you on your way.
Leaving nothing but my heart behind.
What can I do to make it up to you.
Promises don't come easy.
But tell me if there's a way to bring you back home to stay.
Well I'd promises anything to you.
I've been walkin' around with my head hanging down.
Wondrin' what I'm gonna do.
'Cause when you walked out that door.
要求，CMD原始窗口中，不調(diào)節(jié)窗口大小，不生成臨時(shí)文件，居中顯示文本內(nèi)容。輸出如下：
代碼:

[Promise don't come easy]
I should have known all along.
There was something wrong.
I just never read between the lines.
Then I woke up one day and found you on your way.
Leaving nothing but my heart behind.
What can I do to make it up to you.
Promises don't come easy.
But tell me if there's a way to bring you back home to stay.
Well I'd promises anything to you.
I've been walkin' around with my head hanging down.
Wondrin' what I'm gonna do.
'Cause when you walked out that door.

Batcher：

sed -e :a -e "s/^.\{1,77\}$/ /;ta" a.txt

sed.exe
http://xiazai.jb51.net/201010/tools/sed_jb51.rar　

batman：思路說明：
以下代碼是充分findstr命令的示例，使用findstr /n來取得行號(hào)同時(shí)兼容空行，
并將行號(hào)進(jìn)行變量賦值；使用findstr /o來取得第行的字符偏移量，但要通過
上、下行的字符偏移差，因?yàn)樽址浦凳穷愑?jì)遞加的，同時(shí)每行回車增加
兩個(gè)字符偏移，所以不可避免要對最后一行強(qiáng)加回車，在不破壞原文件的情
況下只好生成臨時(shí)文件；利用findstr /o能夠一次性獲得文本所有行的字符偏
移量也就是字符總數(shù)，效率和逐字符判斷相比肯定是高得多了。
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－

復(fù)制代碼代碼如下:

 
@echo off 
copy /y 1.txt 2.txt>nul 
echo.>>2.txtecho end>>2.txt 
for /f "tokens=1,2* delims=: " %%i in ('findstr /n /o .* 2.txt') do ( 
set "_%%i=%%j"set ".%%i=%%k" 
　　if %%i geq 2 call :lp %%i 
) 
del /q 2.txtpause>nulgoto :eof 
:lp 
set /a n=%1-1 
set /a num=_%1-_%n%-2 
set /a kl=(80-num)/2 
for /l %%i in (1,1,%kl%) do set /p= NUL 
call,set /p=%%.%n%%%NULECHO. 

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批處理實(shí)現(xiàn)文本內(nèi)容居中顯示的代碼