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c:\test>perl -de1
Loading DB routines from perl5db.pl version 1.3
...
  DB<2> print $x
12345
  DB<3>

C:\test>path
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBEM;C:\T...
...
PATH=a load of junk here
C:\test>path
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBEM;C:\T...

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

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