[文本处理] 批处理怎么删除TXT文本中的指定行？

wangl

小弟不才~在问个问题

X.TXT中有N行 例如:

1
2
3
4
.....
99999  我想删除前xxx行

怎么写~谢谢!

sgaizxt001

这是我看到的东西，不知道跟主题有关没有，我觉得还是可以看一下。如果看不懂的可以借助GOOGLE。整篇文本复制的，有闲心的不妨看看

可以学习这些代码的defined用法，以及在for里定义变量，for外显示变量来获取指定行数的方法等

    显示指定行的内容

出处：http://www.cn-dos.net/forum/viewthread.php?tid=21647


This page shows how to read specific lines from a text file. There are many ways to have the for /f command read the input file, for instance:-

for /f "delims=" %%a in (input.txt) do ...

for /f "delims=" %%a in ('type input.txt') do ... 

for /f "delims=" %%a in ('more ^< input.txt') do ... 

However, only the last method (using the more command) will give consistent results across Windows NT, 2000, XP and 2003. The first method does not recognise unicode files. Also, the usebackq switch must be used if the input filename contains spaces. The second method, using the type command, also fails to recognise unicode files on Windows 2000, XP and 2003 if the input file does not begin with a bit order mark (BOM).

In all the examples, assume the contents of of the file numbers.txt to be:-

one
two
three
four
five
six
seven
eight
nine
ten

Displaying the first line

This example prints one.

@echo off & setlocal ENABLEEXTENSIONS
set "first="
for /f "delims=" %%a in ('more ^< numbers.txt') do (
  if not defined first set first=%%a
)
echo/%first%

Displaying the first X lines

This example prints one, two and three.

@echo off & setlocal ENABLEEXTENSIONS
set "lines=3"
set i=-1
set "ok=" 
for /f "delims=" %%a in ('more ^< numbers.txt') do (
  set/a i+=1 & for /f %%z in ('echo/%%i%%') do (
    if "%%z"=="%lines%" set ok=1
  )
  if not defined ok echo/%%a
)

Displaying the last line

This example prints ten. 

@echo off & setlocal ENABLEEXTENSIONS
for /f "delims=" %%a in ('more ^< numbers.txt') do set "last=%%a"
echo/%last% 

Displaying the last X lines

This example prints nine and ten. 

@echo off & setlocal ENABLEEXTENSIONS
set "lines=2"
for /f %%a in ('find/c /v "" ^< numbers.txt') do set/a skip=%%a-lines
for /f "delims=" %%a in ('more/e +%skip% ^< numbers.txt') do (
  echo/%%a
)

Displaying the Nth line

This example prints three. Note that instead of using the more command's /e switch, the skip option could have been used with the for /f command, however, this fails is it is set to any number less than one. 

@echo off & setlocal ENABLEEXTENSIONS
set LineNo=3
set "line="
set/a LineNo-=1
for /f "delims=" %%a in ('more/e +%LineNo% ^< numbers.txt') do (
  if not defined line set "line=%%a"
)
echo/%line%

Displaying the Nth line plus X number of lines 

This example prints five and six. 

@echo off & setlocal ENABLEEXTENSIONS
set start=5
set "lines=2"
set/a i=-1,start-=1
set "ok=" 
for /f "delims=" %%a in ('more/e +%start% ^< numbers.txt') do (
  set/a i+=1 & for /f %%z in ('echo/%%i%%') do (
    if "%%z"=="%lines%" set ok=1
  )
  if not defined ok echo/%%a
)
复制代码

[ 本帖最后由 sgaizxt001 于 2010-5-31 00:23 编辑 ]

broly

for /f "skip=XXX" %%i in ('type 1.txt') do echo %%i>>2.txt

CUer

sed "100,$!d" 1.txt >2.txt
复制代码

523066680

上次好像有见到讨论说  文本超过一定长度后命令不能读完。

CUer

gawk "NR>=100" 1.txt >2.txt
复制代码

wangl

原帖由 Batcher 于 2010-5-30 10:58 发表
more +100 1.txt >2.txt

这句代码可以删除前XXX行

可是保留下来的文本不完整 后面的就卡那不动了 可能太大了(4M)

Batcher

more +100 1.txt >2.txt
复制代码