批处理字符串截取_批处理 字符串 比较大小

笔记想读取bat同目录下 a文件夹下的所有文件名，并在for循环体下截取前两位字符串，如图

@echo off &setlocal enabledelayedexpansion
set fa=C:\Users\GilbertXiao\Desktop\a\a


for /f "delims=" %%a in ('dir /b/on %fa%\*.*') do (
set fullname=%%a
echo !fullname!
 for /f "tokens=1,2 delims=." %%b in ("!fullname!") do (
    set name=%%b
    echo !name!

    rem substr the name
    set shortname=!name:~0,2!
    echo !shortname!

    rem write the shortname into b.txt
    echo !shortname!>b.txt
 )
)
pause