End localization of environment changes in a batch file.
Any changes made to an Environment Variable after ENDLOCAL has been issued will be persistent - they will still remain in memory after the batch file has terminated and any previous value stored in that Environment Variable will not be restored.
Ending the cmd.exe session will delete all Environment Variables created with the SET command.
ECHO %v_filename% - this will ECHO the value "c:\test.txt"
If SETLOCAL is used without a corresponding ENDLOCAL then localisation of environment changes will end when the batch file ends
Passing variables from one routine to another
When "&" is used to put several commands on one line, the command processor will convert all the %variables% into their text values before executing any of the commands.
By putting ENDLOCAL and SET commands on one line you are able to SET a variable outside the SETLOCAL-ENDLOCAL block that refers to a variable created inside the block.
ENDLOCAL & SET v_ret1=%v_file%& SET v_ret2=450
You can use several "&" characters in order to SET several variables
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