batch script to add number to a string in loop - batch-file

Question

i need to generate list of dummy users. no of users will be provided as a input.. like 5 or 500 or 5000.
all i want is to have a standard text like usr and append a number and generate the list like usr1, usr2, usr3 etc. I thought i can do this in batch file quickly. but stuck with loop and appending the number to the string.. can some help?
#echo OFF
SETLOCAL ENABLEDELAYEDEXPANSION
set /p numb="Enter how many users to be generated "
set numb2=0
set x=0
set name1=tstusr
set name1=tstusr
set name2=%name1%
for /l %%x in (1,1,%numb%) do (
echo %%x
set numb2=%%x
set name1=tstusr
set name2=%name1%%numb2%
echo %name1%
echo %name2%
)

Answer 1

with a slight modification of your code...
#echo OFF
SETLOCAL ENABLEDELAYEDEXPANSION
set /p numb="Enter how many users to be generated "
set numb2=0
set x=0
set name1=tstusr
set name1=tstusr
set name2=%name1%
for /l %%x in (1,1,%numb%) do (
echo %%x
set numb2=%%x
set name1=tstusr
set name2=!name1!!numb2!
echo !name1!
echo !name2!
)
endlocal

Answer 2

#ECHO OFF
SETLOCAL ENABLEDELAYEDEXPANSION
set /p numb="Enter how many users to be generated "
>q28342811.txt ECHO tstusr%random%
:loop
set "name=tstusr%random%"
FINDSTR /x "%name%" q28342811.txt >NUL
IF ERRORLEVEL 1 SET /a numb -=1&>>q28342811.txt ECHO %name%
IF %numb% gtr 1 GOTO loop
TYPE q28342811.txt
GOTO :EOF
Produces q28342811.txt
generate a random username to the output file, then repeat the operation numb-1 times, checking that the new candidate doesn't already exist in the file first.