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@echo off
setlocal enableDelayedExpansion
prompt $g
echo on
rem Unquoted uses 2 escapes on each pass, so 2^6=64 chars initially!
set v1=^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!
set v2=%v1%
set v3=%v2%
set v
rem Quoted uses only 1 escape per pass, so 2^3=8 chars initially.
set "v1=^^^^^^^!"
set "v2=%v1%"
set "v3=%v2%"
set v
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>rem Unquoted uses 2 escapes on each pass, so 2^6=64 chars initially!
>set v1=^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!
>set v2=^^^^^^^!
>set v3=^!
>set v
v1=^^^^^^^^^^^^^^^!
v2=^^^!
v3=!
>rem Quoted uses only 1 escape per pass, so 2^3=8 chars initially.
>set "v1=^^^^^^^!"
>set "v2=^^^!"
>set "v3=^!"
>set v
v1=^^^!
v2=^!
v3=!
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>rem Unquoted uses 2 escapes on each pass, so 2^6=64 chars initially!
>set v1=^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!
>set v2=!v1!
>set v3=!v2!
>set v
v1=^^^^^^^^^^^^^^^!
v2=^^^^^^^^^^^^^^^!
v3=^^^^^^^^^^^^^^^!
>rem Quoted uses only 1 escape per pass, so 2^3=8 chars initially.
>set "v1=^^^^^^^!"
>set "v2=!v1!"
>set "v3=!v2!"
>set v
v1=^^^!
v2=^^^!
v3=^^^!
endoftest
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rem Unquoted uses 2 escapes on each pass, so 2^2=4 chars initially!
set v1=^^^!
set v2=!v1!
set v3=!v2!
set v
rem Quoted uses only 1 escape per pass, so 2^1=2 chars initially.
set "v1=^!"
set "v2=!v1!"
set "v3=!v2!"
set v
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>rem Unquoted uses 2 escapes on each pass, so 2^2=4 chars initially!
>set v1=^!
>set v2=!v1!
>set v3=!v2!
>set v
v1=!
v2=!
v3=!
>rem Quoted uses only 1 escape per pass, so 2^1=2 chars initially.
>set "v1=^!"
>set "v2=!v1!"
>set "v3=!v2!"
>set v
v1=!
v2=!
v3=!
endoftest
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::--------------------------------------------------------------------------------------------------------------------------
@echo off &prompt $g &echo on
setlocal enableDelayedExpansion
rem Escapes are used when a variable is set, echoed, passed to a variable &passed as a parameter.
rem ::(
rem ::QuickList
rem ::(
rem 0 escapes = 2^0 = 1 = !
rem 1 escape = 2^1 = 2 = ^!
rem 2 escapes = 2^2 = 4 = ^^^!
rem 3 escapes = 2^3 = 8 = ^^^^^^^!
rem 4 escapes = 2^4 = 16 = ^^^^^^^^^^^^^^^!
rem 5 escapes = 2^5 = 32 = ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!
rem 6 escapes = 2^6 = 64 = ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!
rem ::)
rem
rem set is a pass when using set=%variable%
rem Unquoted uses 2 escapes on each pass, so 2^6=64 chars initially!
set v1=^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!
set v2=%v1%
set v3=%v2%
set v
rem set is a pass when using set=%variable%
rem Quoted uses only 1 escape per pass, so 2^3=8 chars initially.
set "v1=^^^^^^^!"
set "v2=%v1%"
set "v3=%v2%"
set v
rem set is only one a pass when using set=!variable!
rem Unquoted uses 2 escapes per pass, so 2^2=4 chars initially!
set v1=^^^!
set v2=!v1!
set v3=!v2!
set v
rem set is only one pass when using set=!variable!
rem Quoted uses 1 escapes per pass, so 2^1=2 chars initially.
set "v1=^!"
set "v2=!v1!"
set "v3=!v2!"
set v
@echo off &echo.endoftest &pause &exit
::--------------------------------------------------------------------------------------------------------------------------
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setlocal enableDelayedExpansion
echo without exclam ^^^^ "^^^^"
echo with exclam ^^^^ "^^^^" !
set "^=one"
set "^^=two"
set "caret=^"
call echo %%!caret!%% caret
call call call call echo ^^^^ "^^^^"
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without exclam ^^ "^^^^"
with exclam ^ "^^"
two caret
^^ "^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"