batch file - Avoid a null value in last for loop iteration? -

i have text file 1 string per line (only couple lines total). file needs searched , each string stored. script prompt user choose 1 of stored strings (if more 1 string/line present in file), loop iterating time when don't want to.

i'm using counter check number of iterations, , read it's nl cr regex issue, finstr /v /r /c:"^$" in file-set in post batch file loop appears running 1 time/iteration doesn't work me (but don't understand correctly).

the "pref" term because strings used prefix of files in same folder...

@echo off setlocal enabledelayedexpansion  set /a x=1 /f %%a in (sys.txt) (   set pref!x!=%%a && echo %^%pref!x!%^% && set /a x+=1 )  echo last value of x = !x!  /l %%a in (1,1,!x!) (   echo !pref%%a! )  rem rest prompt user choose 1 (if multiple) ,  rem   use choice prefix ren %%a %prefx%%%a 

if "sys.txt" contains 3 lines strings a, b, c respectively, output is:

pref1 pref2 pref3 last value of x = 4 b c echo off. 

echo off. not desired, clearly.

you need change increment structure this. (set before each line starting base of 0)

@echo off setlocal enabledelayedexpansion  set "i=0" /f "usebackq delims=" %%a in ("sys.txt") (     set/a "i+=1"     set "pref!i!=%%a"     echo(pref!i!)  echo(last value of = %i%  /l %%a in (1,1,%i%) echo(!pref%%a!