Batch script loop

Question

I need to execute a command 100-200 times  and so far my research indicates that I would either have to copy paste 100 copies of this command  OR use a for loop  but the for loop expects a list of items  hence I would need 200 files to operate on  or a list of 200 items  defeating the point  I would rather not have to write a C program and go through the length of documenting why I had to write another program to execute my program for test purposes  Modification of my program itself is also not an option  So  given a command  a  how would I execute it N times via a batch script  Note  I don t want an infinite loop For example  here is what it would look like in Javascript  var i  for  i   0  i  lt  100  i        console log  i        What would it look like in a batch script running on Windows

User · Answer

Here is a template script I will use    echo off goto Loop   Loop  lt EXTRA SCRIPTING HERE     gt  goto Loop  exit   What this does is when it starts it turns off echo then after that it runs the  Loop  but in that place it keeps going to  Loop   I hope this helps

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Probbally use goto like   echo off  Whatever echo hello world pause echo TEST goto Whatever   This does a inf  infinite  loop

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The answer really depends on how familiar you are with batch  if you are not so experienced  I would recommend incrementing a loop variable    echo off set  a loop 1  repeat echo Hello World  set  a loop  loop  1 if  loop    lt no  of times to repeat gt    goto escapedfromrepeat   goto repeat  escapedfromrepeat echo You have come out of the loop pause   But if you are more experienced with batch  I would recommend the more practical for  l  loop in  1  1  10  do echo  loop is the better choice                 start at 1  go up in 1 s  end at 10  for  l   your choice   start  step  end  do  command of your choice

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And to iterate on the files of a directory    echo off  setlocal enableDelayedExpansion   set MYDIR C  something for  F   x in   dir  B D  MYDIR    do     set FILENAME  MYDIR    x log IL ERROR log   echo                              Search in  FILENAME                                c  utils grep motiv  FILENAME      You must use  enableDelayedExpansion  and  FILENAME  instead of  FILENAME   In the second case  DOS will interpret the variable only once  before it enters the loop  and not each time the program loops

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DOS doesn t offer very elegant mechanisms for this  but I think you can still code a loop for 100 or 200 iterations with reasonable effort  While there s not a numeric for loop  you can use a character string as a  loop variable    Code the loop using GOTO  and for each iteration use SET X  X   to add yet another   sign to an environment variable X  and to exit the loop  compare the value of X with a string of 100  or 200    signs   I never said this was elegant  but it should work

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Not sure if an answer like this has already been submitted yet  but you could try something like this    echo off  start set  a var  1 if  var  EQU 100 goto end    Code you want to run goes here goto start   end echo var has reached  var   pause exit   The variable  var  will increase by one until it reaches 100 where the program then outputs that it has finished executing  Again  not sure if this has been submitted or something like it  but I think it may be the most compact

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Template for a simple but counted loop   set loopcount  Number of times   loop  Commands you want to repeat  set  a loopcount loopcount-1 if  loopcount   0 goto exitloop goto loop  exitloop   Example  Say  Hello World   5 times    echo off set loopcount 5  loop echo Hello World  set  a loopcount loopcount-1 if  loopcount   0 goto exitloop goto loop  exitloop pause   This example will output   Hello World  Hello World  Hello World  Hello World  Hello World  Press any key to continue

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for  l is your friend   for  l  x in  1  1  100  do echo  x   Starts at 1  steps by one  and finishes at 100   Use two  s if it s in a batch file  for  l   x in  1  1  100  do echo   x    which is one of the things I really really hate about windows scripting   If you have multiple commands for each iteration of the loop  do this   for  l  x in  1  1  100  do      echo  x    copy  x txt z  whatever etc     or in a batch file  for  l   x in  1  1  100  do      echo   x    copy   x txt z  whatever etc     Key   l denotes that the for command will operate in a numerical fashion  rather than operating on a set of files  x is the loops variable  starting value  increment of value  end condition inclusive

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Very basic way to implement looping in cmd programming using labels   echo off SET  A  index 1  SET  A  count 5   while if  index  leq  count       echo The value of index is  index     SET  A  index index   1     goto  while

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You can do this without a for statement        echo off  SPINNER SET COUNTP1 1   1 CLS     YOUR COMMAND GOES HERE IF  COUNTP1  EQU 200 goto 2  SET COUNTP1 1   ELSE   SET  A COUNTP1  1   goto 1   2    COMMAND HAS FINISHED RUNNING 200 TIMES   It has basic understanding  Just give it a test   P

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You could also try this instead of a for loop   set count 0  loop set  a count  count  1  Commands here  if  count  neq 100 goto loop  Commands after loop    It s quite small and it s what I use all the time

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I have 2 answers Methods 1  Insert Javascript into Batch   if   a   b   end        batch portion   ECHO OFF  cscript  e jscript    f0       JScript portion     Input Javascript here     I don t know much about JavaScript    Method 2  Loop in Batch      echo off     set loopcount 5      loop     echo Hello World      set  a loopcount loopcount-1     if  loopcount   0 goto exitloop     goto loop      exitloop     pause    Thanks FluorescentGreen5

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EDITED  I made it so it stops after 100 times    echo off goto actual set  a loopcount 0  actual set  a loopcount  loopcount    1 echo  random   random   random   random  timeout 1  nobreak gt nul if  loopcount    100 goto stop goto actual  stop exit   This will generate 4 random numbers ever 1 second 100 times  Take out the  timeout 1  nobreak nul  to make it go super fast

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Or you can decrement increment a variable by the number of times you want to loop   SETLOCAL ENABLEDELAYEDEXPANSION SET counter 200  Beginning IF  counter  NEQ 0   echo  x copy  x txt z  whatever etc SET  A counter  counter -1 GOTO Beginning   ELSE   ENDLOCAL SET counter  GOTO eof   Obviously  using FOR  L is the highway and this is the backstreet that takes longer  but it gets to the same destination

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a completely flawless loop  set num 0  loop    insert code set num  num  1 if  num  neq 10 goto loop   insert after code code   you can edit it by changing the 10 in line 5 to any number to represent how many time you want it to loop

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You could do something to the following effect avoiding the FOR loop   set counter 0  loop echo  input commands here  SET  A counter  counter  1 if  counter  GTR 200  GOTO exit  else  GOTO loop   exit exit

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I use this  It is just about the same thing as the others  but it is just another way to write it    ECHO off set count 0  Loop if  count    how many times to loop  goto end    Commands to execute here  set count  count  1 goto Loop  end

[windows] Batch script loop

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