求cmd批处理文本改编

xuming98

目前有一文本mima.txt，用下列bat为基础改编，要求删除文本中每行字符串中最前T个字符和最后N个字符，T和N实际为数字，每行字符串长短不一，由字母（包括大小写）、数字和符号组成，比如倒数后3位是："/>
现可以删除前T个字符，求在此基础上改编能删除后N个字符
set fn=mima.txt
(for /f "usebackq delims=" %%i in ("%fn%")do (
echo;%%i>
set "h=%%i"
setlocal enabledelayedexpansion
echo;!h:~T!
endlocal))>b.txt
move b.txt "%fn%"

rookie66

@echo off
setlocal enabledelayedexpansion

set fn=mima.txt
set T=前N个字符数值
set N=后N个字符数值

(for /f "usebackq delims=" %%i in ("%fn%") do (
    set "line=%%i"
    set "line=!line:~%T%!"
    set "line=!line:~0,-%N%!"
    echo !line!
)) > b.txt

move /y b.txt "%fn%"
endlocal

xuming98

rookie66 发表于 2024-7-26 13:55
@echo off
setlocal enabledelayedexpansion

感谢！不仅秒回而且正确无误