@echo off
SETLOCAL ENABLEDELAYEDEXPANSION
set abc=????????????????????????? aaabbbccc

:delleft
if "%abc:~0,1%"==" " set abc=%abc:~1%&&goto delleft
echo 去掉左边空格:%abc%

set abc=aaabbbccc ?????????????????????????????????????????????????
:delright
if "%abc:~-1%"==" " set abc=%abc:~0,-1%&&goto delright
echo 去掉右边空格:%abc%

set abc=??????? aaa ??? bbb ????? ccc ??????????
set "abc=%abc: =%"
echo 去掉所有空格:%abc%
pause

?