c:\test>perl -de1
Loading DB routines from perl5db.pl version 1.3
Editor support available.

Enter h or `h h' for help, or `perldoc perldebug' for more help.

main::(-e:1):   1
  DB<1> $x = 12345

  DB<2> print $x
12345
  DB<3>

##</code><code>##

C:\test>path
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBEM;C:\T...
C:\test>cmd /c "set path=a load of junk here && path"
PATH=a load of junk here
C:\test>path
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBEM;C:\T...

##</code><code>##

C:\test>type junk.bat
set test=this is the value set inside the .bat file
c:\test>start /b junk.bat
c:\test>set test=this is the value set inside the .bat file
c:\test>set test
Environment variable test not defined

##</code><code>##

c:\test>type junk.bat
set test1=this persists
setlocal
set test2=this does not persist
endlocal
set test3=and this persists also

c:\test>set | find "test"
c:\test>junk
c:\test>set test1=this persists
c:\test>setlocal
c:\test>set test2=this does not persist
c:\test>endlocal
c:\test>set test3=and this persists also

c:\test>set | find "test"
test1=this persists
test3=and this persists also