why isnt this working? IF "!VV:~0,1!"=="%"

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nnnmmm
Posts: 117
Joined: 26 Aug 2017 06:11

why isnt this working? IF "!VV:~0,1!"=="%"

#1 Post by nnnmmm » 30 Aug 2017 01:55

Code: Select all

@ECHO OFF
SET K1=M:\AA.TXT

SetLocal EnableExtensions EnableDelayedExpansion
FOR /F "DELIMS=" %%V IN ('TYPE "%K1%"') DO (
   SET VV=%%V
   ECHO !VV:~0,1!

   IF "!VV:~0,1!"=="%" ECHO DDDDDDDD
)   
---------------------
AA.TXT has
%c1%\1.exe
%q1%\b.exe
ss.exe
dd.exe


why cant IF detect "%", while it echos correctly?
how can i solve?

penpen
Expert
Posts: 1991
Joined: 23 Jun 2013 06:15
Location: Germany

Re: why isnt this working? IF "!VV:~0,1!"=="%"

#2 Post by penpen » 30 Aug 2017 02:42

The percentage sign is a special character that indicates that the following might be an environment variable.
In your case you are using the environment variable '" ECHO DDDDDDDD' (without the outer single quotes).
But there is a way to escape a percentage sign (== using a replacement string for this character): '%%'.

Code: Select all

   IF "!VV:~0,1!"=="%%" ECHO DDDDDDDD


penpen

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