Logical operators and or in DOS batch

Question

How would you implement logical operators in DOS Batch files

User · Answer

It s just as easy as the following   AND  if if  if   VAR1     VALUE  if   VAR2     VALUE   do something    OR  if    if  set BOTH 0 if   VAR1     VALUE  if   VAR2     VALUE  set BOTH 1 if   BOTH     0  if   VAR1     VALUE   do something  if   BOTH     0  if   VAR2     VALUE   do something    I know that there are other answers  but I think that the mine is more simple  so more easy to understand  Hope this helps you

User · Answer

Only the OR part is tricky  but with a general boolean expression containing NOT OR AND the only nice solution is this   REM if A    B OR C    C then yes   call  strequ A B    call  strequ C C   amp  amp  echo yes exit  b   strequ if   1       2  exit  b 0 exit  b 1

User · Answer

You can do and with nested conditions   if  age  geq 2       if  age  leq 12           set class child           or   if  age  geq 2 if  age  leq 12 set class child   You can do or with a separate variable   set res F if  hour  leq 6 set res T if  hour  geq 22 set res T if   res     T        set state asleep

User · Answer

OR is slightly tricky  but not overly so  Here is an example  set var1   1 set var2   2    set or   if   var1     Stack  set or  true if   var2     Overflow  set or  true if defined or  echo Stack OR Overflow

User · Answer

If you have interested to write an if AND OR in one statement  then there is no any of it  But  you can still group if with  amp  amp     and     statements to achieve that you want in one line w o any additional variables and w o if-else block duplication  single echo command for TRUE and FALSE code sections     echo off  setlocal  set  A 1   amp  set  B 2   amp  call  IF AND set  A 1   amp  set  B 3   amp  call  IF AND set  A 2   amp  set  B 2   amp  call  IF AND set  A 2   amp  set  B 3   amp  call  IF AND  echo   set  A 1   amp  set  B 2   amp  call  IF OR set  A 1   amp  set  B 3   amp  call  IF OR set  A 2   amp  set  B 2   amp  call  IF OR set  A 2   amp  set  B 3   amp  call  IF OR  exit  b 0   IF OR     if  A  EQU 1   type nul gt nul   else type 2 gt nul        if  B  EQU 2   type nul gt nul   else type 2 gt nul        echo FALSE- amp  type 2 gt nul      amp  amp  echo TRUE   exit  b 0   IF AND     if  A  EQU 1   type nul gt nul   else type 2 gt nul    amp  amp    if  B  EQU 2   type nul gt nul   else type 2 gt nul    amp  amp  echo TRUE       echo FALSE-   exit  b 0   Output   TRUE  FALSE- FALSE- FALSE-  TRUE  TRUE  TRUE  FALSE-   The trick is in the type command which drops sets the errorlevel and so handles the way to the next command

User · Answer

An alternative is to look for a unix shell which does give you logical operators and a whole lot more  You can get a native win32 implementation of a Bourne shell here if you don t want to go the cygwin route  A native bash can be found here  I m quite certain you could easily google other good alternatives such as zsh or tcsh   K

User · Answer

The IF statement does not support logical operators AND and OR  Cascading IF statements make an implicit conjunction  IF Exist File1 Dat IF Exist File2 Dat GOTO FILE12 EXIST LABEL  If File1 Dat and File2 Dat exist then jump to the label FILE12 EXIST LABEL  See also  IF

User · Answer

The following examples show how to make an AND statement  used for setting variables or including parameters for a command    To start Notepad and close the CMD window   start notepad exe  amp  exit   To set variables x  y  and z to values if the variable  a  equals blah   IF   a     blah   set x 1   amp   set y 2   amp   set z 3    Hope that helps

User · Answer

Athul Prakash  age 16 at the time  gave a logical idea for how to implement an OR test by negating the conditions in IF statements and then using the ELSE clause as the location to put the code that requires execution  I thought to myself that there are however two else clauses usually needed since he is suggesting using two IF statements  and so the executed code needs to be written twice  However  if a GOTO is used to skip past the required code  instead of writing ELSE clauses the code for execution only needs to be written once   Here is a testable example of how I would implement Athul Prakash s negative logic to create an OR   In my example  someone is allowed to drive a tank if they have a tank licence OR they are doing their military service  Enter true or false at the two prompts and you will be able to see whether the logic allows you to drive a tank    ECHO OFF  SET  p tanklicence tanklicence   SET  p militaryservice militaryservice   IF  I NOT  tanklicence   true IF  I NOT  militaryservice   true GOTO done  ECHO I am driving a tank with tanklicence set to  tanklicence  and militaryservice set to  militaryservice    done  PAUSE

User · Answer

Try the negation operand -  not    Well  if you can perform  AND  operation on an if statement using nested  if s  refer previous answers   then you can do the same thing with  if not  to perform an  or  operation   If you haven t got the idea quite as yet  read on  Otherwise  just don t waste your time and get back to programming   Just as nested  if s are satisfied only when all conditions are true  nested  if not s are satisfied only when all conditions are false  This is similar to what you want to do with an  or  operand  isn t it   Even when any one of the conditions in the nested  if not  is true  the whole statement remains non-satisfied  Hence  you can use negated  if s in succession by remembering that the body of the condition statement should be what you wanna do if all your nested conditions are false  The body that you actually wanted to give should come under the else statement   And if you still didn t get the jist of the thing  sorry  I m 16 and that s the best I can do to explain

User · Answer

Slight modification to Andry s answer  reducing duplicate type commands   set  A 1   amp  set  B 2   amp  call  IF AND set  A 1   amp  set  B 3   amp  call  IF AND set  A 2   amp  set  B 2   amp  call  IF AND set  A 2   amp  set  B 3   amp  call  IF AND  echo   set  A 1   amp  set  B 2   amp  call  IF OR set  A 1   amp  set  B 3   amp  call  IF OR set  A 2   amp  set  B 2   amp  call  IF OR set  A 2   amp  set  B 3   amp  call  IF OR  goto  eof   IF OR   if  i not  A  EQU 1      if  i not  B  EQU 2         echo FALSE-       type 2 gt nul          amp  amp  echo TRUE   goto  eof   IF AND    if  i  A  EQU 1      if  i  B  EQU 2         echo TRUE        type 2 gt nul          amp  amp  echo FALSE-  goto  eof

User · Answer

De Morgan s laws allow us to convert disjunctions   OR   into logical equivalents using only conjunctions   AND   and negations   NOT    This means we can chain disjunctions   OR   on to one line   This means if name is  Yakko  or  Wakko  or  Dot   then echo  Warner brother or sister    set warner true if not   name     Yakko  if not   name     Wakko  if not   name     Dot  set warner false if   warner     true  echo Warner brother or sister   This is another version of paxdiablo s  OR  example  but the conditions are chained on to one line   Note that the opposite of leq is gtr  and the opposite of geq is lss    set res true if  hour  gtr 6 if  hour  lss 22 set res false if   res     true  set state asleep

[batch-file] Logical operators ("and", "or") in DOS batch

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