Counting in a FOR loop using Windows Batch script

Question

Can anyone explain this   I am able to count in a loop using the Windows command prompt  using this method   SET  A XCOUNT 0  loop SET  A XCOUNT  1 echo  XCOUNT  IF   XCOUNT       4      GOTO end   ELSE     GOTO loop    end   But this method does not work  it prints out  1  for each line in the file    It acts like the variable is out of scope   SET  A COUNT 1 FOR  F  tokens      A IN  config properties  DO     SET  A COUNT  1   ECHO  COUNT

User · Answer

Here is a batch file that generates all 10 x x x addresses   echo off  SET  A X 0 SET  A Y 0 SET  A Z 0   loop SET  A X  1 echo 10  X   Y   Z  IF   X       256     GOTO end    ELSE    GOTO loop2  GOTO loop       loop2 SET  A Y  1 echo 10  X   Y   Z  IF   Y       256      SET  A Y 0   GOTO loop     ELSE      GOTO loop3    GOTO loop2       loop3  SET  A Z  1 echo 10  X   Y   Z  IF   Z       255      SET  A Z 0   GOTO loop2    ELSE      GOTO loop3      end

User · Answer

It s not working because the entire for loop  from the for to the final closing parenthesis  including the commands between those  is being evaluated when it s encountered  before it begins executing   In other words   count  is replaced with its value 1 before running the loop   What you need is something like   setlocal enableextensions enabledelayedexpansion set  a count   1 for  f  tokens      a in  config properties  do     set  a count    1   echo  count    endlocal   Delayed expansion using   instead of   will give you the expected behaviour  See also here     Also keep in mind that setlocal endlocal actually limit scope of things changed inside so that they don t leak out  If you want to use count after the endlocal  you have to use a  trick  made possible by the very problem you re having   endlocal  amp  amp  set count  count    Let s say count has become 7 within the inner scope  Because the entire command is interpreted before execution  it effectively becomes   endlocal  amp  amp  set count 7   Then  when it s executed  the inner scope is closed off  returning count to it s original value  But  since the setting of count to seven happens in the outer scope  it s effectively leaking the information you need   You can string together multiple sub-commands to leak as much information as you need   endlocal  amp  amp  set count  count   amp  amp  set something else  something else

User · Answer

for a   1 to 100 step 1  Command line in Windows   Please use   a if running in Batch file       for  L  a in  1 1 100  Do echo  a

[windows] Counting in a FOR loop using Windows Batch script

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