How to use a substring in for loop of batch script?

Question

This is my first batch script. I want to convert a list of files and use a substring of the input filename (Day of year). However the substring part doesn't work:

SETLOCAL EnableDelayedExpansion

FOR %G IN (%dirInp%%station%???0.DAT) DO (

SET filInp="%G"

SET doy=!filInp:~-9,3! rem this doesn't work?

rem Convert Trimble GPS receiver observations to RINEX
%dirExe%teqc -tr d %G > %dirOut%%station%!doy!0.%yy%D
)

So, how should I do this?

you should get an error message. For use in batchfile, use %%G instead of %G. set filInp="%G" should be set "filInp=%%G" — Stephan
– Stephan, Commented Feb 28, 2018 at 11:19
Ok I changed the batch script using %%G it seems to work now. I actually tried that first, but there I think I used % instead of ! for the doy-variable. (And then I copied the code to the cmd-window earlier to see the error output and used %G, but forgot about that). Thank you! — fly
– fly, Commented Feb 28, 2018 at 12:21

and1er · Accepted Answer · 2019-01-23 10:26:17Z

3

In addition to @Stephan 's comment I've updated your code to make a minimal working example (MWE) using some abstact file paths and substring parameters.

Than I moved SETLOCAL EnableDelayedExpansion inside the FOR loop and now it works for me on Windows 7.

I also closed SETLOCAL EnableDelayedExpansion by endlocal (could be sensitive for further code excecution

@echo off

FOR %%G IN (C:\DirInput_StationA\201901.DAT C:\DirInput_StationB\201812.DAT) DO (
    SETLOCAL EnableDelayedExpansion
    SET "filInp=%%G"

    SET "doy=!filInp:~-10,4!"

    rem Convert Trimble GPS receiver observations to RINEX
    REM Changed your call to echo of the vars
    echo G: "%%G"; doy: "!doy!"
    endlocal
)

answered Jan 23, 2019 at 10:26

and1er

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