CODEWITHSUNDEEP
batch-filecmd
acr
acr

Reputation: 1746

read through each line and check if line start with a specific string using batch file

I am trying read all lines in out.txt and check if that starts with word No. If the line starts with No, I am echoing yes to file 1.txt, else no to 2.txt I am using below code :

for /F "tokens=*" %%A in (out.txt) do (

IF "%%A:~0,2%"=="No" (

@echo yes >> 1.txt

)else (

@echo no >> 2.txt

)
)

but its nit working for me. seems like the if statement is not working correctly. Can someone please tell me if there is something wrong with the code ?. I tried to echo %%A and is reading the lines as expected.

Upvotes: 2

Views: 2817

Answers (2)

jwdonahue
jwdonahue

Reputation: 6659

This is faster:

@setlocal ENABLEEXTENSIONS
@set prompt=$G

@for /F "tokens=*" %%A in (out.txt) do @call :DoIt "%%A"
@exit /b 0

:DoIt
@set _line=%~1
@set _linePrefeix=%_line:~0,2%
@if "%_linePrefeix%" equ "No" (@echo yes >> 1.txt) else (@echo no >> 2.txt)
@exit /b 0

Magoo's solution and this one both require two processes, but this one involves an executable image that is already loaded into memory (cmd.exe).

Upvotes: 1

Magoo
Magoo

Reputation: 80023

You cannot substring a metavariable.

Try

findstr /b /L "No"  out.txt >nul
if errorlevel 1 (
 echo not found
) else (
 echo found
)

which finds any line in the file that /b begins /L with the literal No and outputs any found. The >nul disposes of the output. errorlevel is set to 0 if the string was found, non-zero otherwise.

Upvotes: 3

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