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Can anyone please explain exactly how the following code works, line by line. I'm really lost. I've been trying to learn how to use the FOR command but I don't understand this.

@echo off
for /f "tokens=* delims= " %%f in (myfile) do (
  set line=%%f
  call :processToken
  goto :eof
:processToken
  for /f "tokens=1* delims=/" %%a in ("%line%") do (
  echo Got one token: %%a
  set line=%%b
  if not "%line%" == "" goto :processToken
  goto :eof
is the start of the subroutine mentioned above.
for /f "tokens=1* delims=/" %%a in ("%line%") do
will then split the line at /, but stopping tokenization after the first token.
echo Got one token: %%a
will output that first token and
set line=%%b
will set the line variable to the rest of the line.
if not "%line%" == "" goto :processToken
And if line isn't yet empty (i.e. all tokens processed), it returns to the start, continuing with the rest of the line.
                The %%b is pure misinformation. Only %%a is assigned in the loop and line=%%b would just assign "%b" to "line"
– GrayFace
                Apr 7 at 14:51