1@echo off
2cls
3
4echo 1 2 3 4 | find "2"
5if errorlevel 1 goto :a1
6if not errorlevel 1 goto :a2
7
8:a1
9echo string not found
10goto :end1
11
12:a2
13echo string found
14goto :end1
15:end1
16
17echo 1 2 3 4 | find "5"
18if errorlevel 1 goto :a3
19if not errorlevel 1 goto :a4
20
21:a3
22echo string not found
23goto :end
24
25:a4
26echo string found
27goto :end
28
29:end
30pause

this command was either broken or dosbox was not meant to implement this, both results were the same, when they could NOT be the same.
it works in dosbox-x well.

if it wasnt meant for dosbox to implement this, dosbox should have given an error message, but it looked like dosbox was processing it as if it was rightfully working.

this one is hurting badly when there are not many DOS commands to work with in dosbox.

find "abc" aa1.txt, this natural FIND command in dosbox was not implemented from the start, it caused an immediate syntax error, which i understood

i think i got nothing to use for finding

i checked these commands, no working in dosbox
echo %~d0 - understandable if not working
echo %~dp0 - understandable if not working
echo %~p0 - understandable if not working
echo %0 except for this
echo %1 except for this
echo %CD%
echo %__CD__%

FOR %%v IN (aa bb cc) DO echo %%v - this one also hurts