How to use random in BATCH script

Question

User · Answer

echo off title Professional Hacker color 02  matrix echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random   echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random    echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random   echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random   echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random   echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random   echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random    echo  random  random  random  random  random  random  random  random  random  random  random  random  random  random  random    goto matrix

User · Answer

Let s say you want a number 1-5  you could use the following        LOOP     set NUM  random  -1 1      if  NUM  GTR 5       goto LOOP       goto NEXT   Or you could use   1 1 in place of   -1 1  The   -1 1 is not needed  but it greatly reduces the amount of time it takes to hit the right range  Let s say you want a number 1-50  we need to decide between 2 digits and 1 digit  Use        LOOP     set RAN1  random  -1 1      if  RAN1  GTR 5       goto 1       if  RAN1   5       goto LOOP       goto 2       1     set NUM  random  -1 1      goto NEXT       2     set NUM  random  -1 2      goto NEXT   You can add more to this algorithm to decide between large ranges  such as 1-1000

User · Answer

here is a example i created for you  it should display a dialog asking you to select a number 1-10  depending on the number you select  it will generate a random number example to a  batch file that you named  If you select  1  then you will get a random 1 digit number example  if you select  10  then you will get a random 10 digit number example    echo off color f0 set  p  FileName  Enter Filename  Without Extension      echo  echo off  gt  gt   FileName  bat echo File Created  pause cls  CommandLine set  p  calc    ComputerName   Enter a number to recieve the amount of  random digits    if  calc   genrand help goto GenerateRandomHelp if  calc   1 echo echo   RANDOM  -1    gt  gt   FileName  bat if  calc   2 echo echo   RANDOM  -1    RANDOM  -1    gt  gt   FileName  bat  if  calc   3 echo echo   RANDOM  -1    RANDOM  -1   RANDOM  -1    gt  gt    FileName  bat if  calc   4 echo echo   RANDOM  -1    RANDOM  -1    RANDOM  -1    RANDOM  -1    gt  gt   FileName  bat if  calc   5 echo echo   Random    gt  gt   FileName  bat if  calc   6 echo echo   Random    RANDOM  -1    gt  gt   FileName  bat if  calc   7 echo echo   Random    RANDOM  -1    RANDOM  -1    gt  gt   FileName  bat  if  calc   8 echo echo   Random    RANDOM  -1    RANDOM  -1    RANDOM  -1    gt  gt   FileName  bat if  calc   9 echo echo    Random    RANDOM  -1    RANDOM  -1    RANDOM  -1    RANDOM  -1    gt  gt    FileName  bat if  calc   10 echo echo   Random    Random    gt  gt   FileName  bat   goto CommandLine

User · Answer

IF not   1      max   start  MAX cmd  Q  C  0 max amp X ELSE set C 1 amp set D 2 amp wmic process where name  cmd exe  CALL setpriority  REALTIME  gt NUL  amp CLS  Y title  random 6 random  random  random  random 9 random  random  random  random  random  random  random  random  random  random  random  random  amp color  D  amp ECHO  random  C  random  random  random  random 6 random 9 random  random  random  random  random  random  random  random  random  amp  IF  C  EQU 46  TIMEOUT  T 1  NOBREAK gt nul amp set C 1 amp CLS amp IF  D  EQU 9  set D 1 ELSE set  A D  D  1 ELSE set  A C  C  1  amp goto Y   simplified with multiple IF statements and plenty of

User · Answer

echo off  amp  setLocal EnableDelayedExpansion  for  L   a in  1 1 100  do   echo  random

User · Answer

set  a number  random      maximum - minimum    example     set  a number  random     100-50   will give a random number between 100 and 50  Be sure to only use one percentage sign as the operand if you are not using the line in a batch script

User · Answer

If you will divide by some large value you will get a huge amount of duplicates one after other  What you need to do is to take modulo of the  RANDOM  value    echo off REM  SET maxvalue 10 SET minvalue 1  SETLOCAL  SET  A tmpRandom    RANDOM      maxvalue      minvalue   echo  Tmp random   tmpRandom   echo  Random    RANDOM   ENDLOCAL

User · Answer

RANDOM  gives you a random number between 0 and 32767   Using an expression like SET  A test  RANDOM    100   32768   1  you can change the range to anything you like  here the range is  1   100  instead of  0   32767

User · Answer

You ll probably want to get several random numbers  and may want to be able to specify a different range for each one  so you should define a function   In my example  I generate numbers from 25 through 30 with call rand 25 30   And the result is in RAND NUM after that function exits    echo off  amp  setlocal EnableDelayedExpansion  for  L   a in  1 1 10  do           call rand 25 30         echo  RAND NUM     goto EOF  REM The script ends at the above goto EOF   The following are functions   REM rand   REM Input   1 is min   2 is max  REM Output  RAND NUM is set to a random number from min through max   rand SET  A RAND NUM  RANDOM      2 -  1   1    32768    1 goto EOF

User · Answer

And just to be completely random  a total lack of order  SET  A V  random    15  1    IF not   1      max   start  MAX cmd  Q  C  0 max amp X ELSE set C 1 amp set V A amp wmic process where name  cmd exe  CALL setpriority  REALTIME  gt NUL  amp CLS  Y  IF  V  EQU 10 set V A  amp  IF  V  EQU 11 set V B  amp  IF  V  EQU 12 set V C  amp  IF  V  EQU 13 set V D  amp  IF  V  EQU 14 set V E  amp  IF  V  EQU 15 set V F  title  V  random 6 random  random  random  random 9 random  random  random  random  random  random  random  random  random  random  random  random  amp color  V  amp ECHO  random  C  random  random  random  random 6 random 9 random  random  random  random  random  random  random  random  random  amp  IF  C  EQU 46  TIMEOUT  T 1  NOBREAK gt nul amp set C 1 amp CLS amp SET  A V  random    15  1 ELSE set  A C  C  1  amp goto Y

User · Answer

You could do it this way  which does not require EnableDelayedExpansion   choosenamea cls set  a choosemname  random   if  choosemname  GTR  max  goto choosenameb if  choosemname  LSS  min  goto choosenameb goto gotnamenow   where max is your max and min is your minimum  This is not very efficient since might take a lot of rounds if your range is too small  Also  this will not work for numbers larger than 32767

User · Answer

And just to be completely random for those who don t always want a black screen     IF not   1      max   start  MAX cmd  Q  C  0 max amp X ELSE set A 0 amp set C 1 amp set V A amp wmic process where name  cmd exe  CALL setpriority  REALTIME  gt NUL  amp CLS  Y  IF  A  EQU 10 set A A  amp  IF  A  EQU 11 set A B  amp  IF  A  EQU 12 set A C  amp  IF  A  EQU 13 set A D  amp  IF  A  EQU 14 set A E  amp  IF  A  EQU 15 set A F   IF  V  EQU 10 set V A  amp  IF  V  EQU 11 set V B  amp  IF  V  EQU 12 set V C  amp  IF  V  EQU 13 set V D  amp  IF  V  EQU 14 set V E  amp  IF  V  EQU 15 set V F   IF  A  EQU  V  set A 0  title  A  V  random 6 random  random  random  random 9 random  random  random  random  random  random  random  random  random  random  random  random  amp color  A  V  amp ECHO  random  C  random  random  random  random 6 random 9 random  random  random  random  random  random  random  random  random  amp  IF  C  EQU 46  TIMEOUT  T 1  NOBREAK gt nul amp set C 1 amp CLS amp SET  A A  random    15  1 amp SET  A V  random    15  1 ELSE set  A C  C  1  amp goto Y     This will change screen color also both are random

User · Answer

now featuring all the colors of the dos rainbow    IF not   1      max   start  MAX cmd  Q  C  0 max amp X    ELSE set C 1 amp set D A amp wmic process where name  cmd exe  CALL setpriority  REALTIME  gt NUL  amp CLS  Y set V  D    IF  V  EQU 10 set V A        amp   IF  V  EQU 11 set V B       amp   IF  V  EQU 12 set V C       amp   IF  V  EQU 13 set V D        amp   IF  V  EQU 14 set V E       amp   IF  V  EQU 15 set V F  title  random 6 random  random  random  random 9 random  random  random  random  random  random  random  random  random  random  random  random  amp color  V  amp ECHO  random  C  random  random  random  random 6 random 9 random  random  random  random  random  random  random  random  random   amp  IF  C  EQU 46  TIMEOUT  T 1  NOBREAK gt nul amp set C 1 amp CLS amp IF  D  EQU 15  set D 1 ELSE set  A D  D  1    ELSE set  A C  C  1  amp goto Y

User · Answer

RANDOM  gives you a random number between 0 and 32767    You can control the number s range with   set  a num  random    100   - will produce number between 0 99   This one   set  a num  random    100  1   - will produce number between 1 100

[windows] How to use random in BATCH script?

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