How to run two for loops in parallel in batch script

Question

As a part of an assignment, I need to run two for loops in parallel in batch script. How can I run two for loops in parallel in batch script. In brief, I am using the following code to replace the contents present in file 1 with the contents present in file 2 but in a parallel manner.

Code:

FOR /f ('use backqdelims=' %%G in `type D:\Users\krkarthi\Desktop\input1.txt`) && ('use backqdelims=' %%H in `type D:\Users\krkarthi\Desktop\input2.txt`) DO cscript D:\Users\krkarthi\Desktop\replace.vbs "D:\Users\krkarthi\Desktop\test.txt" "%%~G" "%%~H")

In the above script, input1.txt and input2.txt contains the data which are defined with G and H variables. I need the ouput to be generated in a test.txt file.

The code should be executed in such a way that G and H variables should take the inputs in parallel from input1.txt and input2.txt

Please let me me know if you need more clarification on this

I'm very interested to see what people come up with, as to my knowledge, this isn't possible with traditional `for` loops running in a single script. — SomethingDark, May 15 '18 at 13:11
Your code is syntax wise and by (your) formatting a mess. You can't have for loops run in parallel - you can read several files in parallel with different input streams. But if you want to replace all lines in file 1 why however don't simply copy the file over? — , May 15 '18 at 13:18
Closely related: [How can two text files be read in parallel by a batch file?](https://stackoverflow.com/q/38214874) — aschipfl, May 15 '18 at 13:57

score 1 · Answer 1 · answered May 15 '18 at 13:13

1

You may use FOR for input1 and get line after line from input2 with SET /P:

SETLOCAL ENABLEDELAYEDEXPANSION
(FOR /F %%G in (D:\Users\krkarthi\Desktop\input1.txt) DO (
    SET /P H=
    cscript D:\Users\krkarthi\Desktop\replace.vbs "D:\Users\krkarthi\Desktop\test.txt" "%%~G" !H!
))<D:\Users\krkarthi\Desktop\input2.txt

You will lose, however, argument handling for input2 (note !H!, not "%%~H").

Also, you must ensure same number of lines in both inputs.

If I were you, I would switch to vbscript.

answered May 15 '18 at 13:13

LS_ᴅᴇᴠ

10,823
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The more modern variant would be PowerShell. – May 15 '18 at 13:21
the above script doesn't revert any solution. The output hasn't changed – karthik Jun 14 '18 at 12:23
I don't have your input neither `replace.vbs`. Place `ECHO` before `CSCRIPT` and check if desired command line is showing up. – LS_ᴅᴇᴠ Jun 14 '18 at 12:45
here is my script "replace.vbs" – karthik Jun 14 '18 at 15:25
It doesn't matter, `replace.vbs` is well known in SO. Question here is checking command line output (ie, using `ECHO`). – LS_ᴅᴇᴠ Jun 15 '18 at 12:18

score 0 · Answer 2 · answered Jun 15 '18 at 06:25

0

Here is my replace.vbs script

Const Readpurpose = 1
Const Writepurpose = 2

strServiceMonFile = Wscript.Arguments(0)
strOldText = Wscript.Arguments(1)
strNewText = Wscript.Arguments(2)

set objFSO = createObject("Scripting.FileSystemObject")
set objFile = objFSO.OpenTextFile(strServiceMonFile,Readpurpose)
strText = objFile.ReadAll
objFile.close

set objFile = objFSO.OpenTextFile(strServiceMonFile,Writepurpose)
strNewText = Replace(strText, strOldText, strNewText)
objFile.Write strNewText
objFile.close

answered Jun 15 '18 at 06:25

karthik

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7
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This is answer or question ? – 4b0 Jun 15 '18 at 06:26
I am trying to use a **replace.vbs** script which is actually used to replace the contents in an existing file with new content. As one can see in the **replace.vbs** code, strText used to identify the existing file and read all the content in that file. strOldText is a content (a line) of the existing file which is to be replaced and strNewText is a new content (a line) which to be replaced with. I am using the vbscript to perform the replace operation and I am trying to use the batch file by using some loops to read the contents in parallel while executing vbscript – karthik Jun 15 '18 at 10:25

How to run two for loops in parallel in batch script

2 Answers2