CODEWITHSUNDEEP
batch-filefor-loopcmdset
user3630856
user3630856

Reputation: 11

SET VARIABLE FROM A TEXT FILE

hi I am trying to set a variable read from a text file. I am using a FOR cycle and I can read every line from a text but when I try to use the SET command I can't save it into a variable named: myvar. What am I doing wrong. Any ideas: this is my code: 

@echo off 
FOR /F "usebackq tokens=*" %%a IN (c:\users\victor\desktop\v1.txt) DO ( 
echo:%%a >> result.txt 
set myvar=%%a 
echo:%myvar%  
) 
@PAUSE

Upvotes: 0

Views: 108

Answers (1)

Magoo
Magoo

Reputation: 79982

Within a block statement (a parenthesised series of statements), the entire block is parsed and then executed. Any %var% within the block will be replaced by that variable's value at the time the block is parsed - before the block is executed - the same thing applies to a FOR ... DO (block).

Hence, IF (something) else (somethingelse) will be executed using the values of %variables% at the time the IF is encountered.

Two common ways to overcome this are 1) to use setlocal enabledelayedexpansion and use !var! in place of %var% to access the changed value of var or 2) to call a subroutine to perform further processing using the changed values.

See any of many, many, many SO entries regarding "delayedexpansion"

Upvotes: 1

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