How do you loop in a Windows batch file

Question

What is the syntax for a FOR loop in a Windows batch file

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From FOR    help doc   FOR  variable IN  set  DO command  command-parameters                        variable  Specifies a single letter replaceable parameter     set       Specifies a set of one or more files   Wildcards may be used    command    Specifies the command to carry out for each file    command-parameters              Specifies parameters or switches for the specified command     To use the FOR command in a batch program  specify   variable instead of  variable   Variable names are case sensitive  so  i is different from  I                                                                     If Command Extensions are enabled  the following additional forms of the FOR command are supported                                      FOR  D  variable IN  set  DO command  command-parameters                    If set contains wildcards  then specifies to match against directory   names instead of file names                                              FOR  R   drive  path   variable IN  set  DO command  command-parameters     Walks the directory tree rooted at  drive  path  executing the FOR     statement in each directory of the tree   If no directory              specification is specified after  R then the current directory is      assumed   If set is just a single period     character then it         will just enumerate the directory tree                                   FOR  L  variable IN  start step end  DO command  command-parameters         The set is a sequence of numbers from start to end  by step amount     So  1 1 5  would generate the sequence 1 2 3 4 5 and  5 -1 1  would    generate the sequence  5 4 3 2 1

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FOR will give you any information you ll ever need to know about FOR loops  including examples on proper usage

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Type   for      and you will get several pages of help text

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If you want to do something x times  you can do this   Example  x   200    FOR  L   A IN  1 1 200  DO     ECHO   A     1 1 200 means    Start   1 Increment per step   1 End   200

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echo off echo  set  p num1 Enter Prelim  echo  set  p num2 Enter Midterm  echo  set  p num3 Enter Semi  echo  set  p num4 Enter Finals  echo  set  a ans  num1   num2   num3   num4  set  a avg  ans  4 ECHO  avg  if  avg  gt   95  goto true  true echo The two numbers you entered were the same  echo  pause exit

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Try this code    echo off color 02 set num1 0 set num2 1  set terminator 5  loop set  a num1   num1     num2  if  num1    terminator  goto close goto open  close echo  num1  pause  exit  open echo  num1  goto loop   num1 is the number to be incremented and num2 is the value added to num1 and terminator is the value where the num1 will end  You can indicate different value for terminator in this statement  if  num1    terminator  goto close   This is the boolean expression goto close is the process if the boolean is true and goto open is the process if the boolean is false

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FOR   A IN  list  DO command parameters   list    is a list of any elements  separated by either spaces  commas or semicolons   command     can be any internal or external command  batch file or even - in OS 2 and NT - a list of commands  parameters  contains the command line parameters for command  In this example  command will be executed once for every element in list  using parameters if specified   A special type of parameter  or even command  is   A  which will be substituted by each element from list consecutively   From FOR loops

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Conditionally perform a command several times    syntax-FOR-Files  FOR   parameter IN  set  DO command   syntax-FOR-Files-Rooted at Path     FOR  R   drive  path    parameter IN  set  DO command   syntax-FOR-Folders  FOR  D   parameter IN  folder set  DO command   syntax-FOR-List of numbers     FOR  L   parameter IN  start step end  DO command   syntax-FOR-File contents     FOR  F   options     parameter IN  filenameset  DO command    or   FOR  F   options     parameter IN   Text string to process   DO command  syntax-FOR-Command Results   FOR  F   options     parameter IN   command to process   DO command    It   Take a set of data Make a FOR Parameter   G equal to some part of that data Perform a command  optionally using the parameter as part of the command   --  Repeat for each item of data   If you are using the FOR command at the command line rather than in a batch program  use just one percent sign   G instead of   G   FOR Parameters   The first parameter has to be defined using a single character  for example the letter G  FOR   G IN      In each iteration of a FOR loop  the IN         clause is evaluated and   G set to a different value  If this clause results in a single value then   G is set equal to that value and the command is performed   If the clause results in a multiple values then extra parameters are implicitly defined to hold each  These are automatically assigned in alphabetical order   H   I   J     implicit parameter definition   If the parameter refers to a file  then enhanced variable reference can be used to extract the filename path date size   You can of course pick any letter of the alphabet other than   G  but it is a good choice because it does not conflict with any of the pathname format letters  a  d  f  n  p  s  t  x  and provides the longest run of non-conflicting letters for use as implicit parameters

[batch-file] How do you loop in a Windows batch file?

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