Windows Batch file execution error -

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i trying run batch file concatenate csv files pattern contracteligibility_* in working folder.they of same format , need concatenate without repeating header.

the code follows:

@echo off>combined.csv cls setlocal enabledelayedexpansion  if exist c:\users\kartikeya.avasthi\desktop\batch_scripts\combined.csv del c:\users\kartikeya.avasthi\desktop\batch_scripts\combined.csv  dir /a-d /b c:\users\kartikeya.avasthi\desktop\batch_scripts\contracteligibility_*.csv>c:\users\kartikeya.avasthi\desktop\batch_scripts\dirfiles.txt  cd c:\users\kartikeya.avasthi\desktop\batch_scripts\  /f "tokens=*" %%a in (c:\users\kartikeya.avasthi\desktop\batch_scripts\dirfiles.txt) (     set /p header=<%%a     echo !header!>combined.csv )  /f "tokens=*" %%a in (c:\users\kartikeya.avasthi\desktop\batch_scripts\dirfiles.txt) (         more +1 %%a>>combined.csv    )  del dirfiles.txt

it concatenates fine getting "echo off " @ start of file first line. know first loop (the 1 in bold) responsible passing null value in variable header. files in set path. can me solve problem. placing drop after echo not acceptable batch file followed automated load utilizes created file combined.csv.

the equivalent code below solve problem, run faster, , looks cleaner...

@echo off setlocal enabledelayedexpansion  cls  cd c:\users\kartikeya.avasthi\desktop\batch_scripts\  set "header=" (for %%a in (contracteligibility_*.csv) (     if not defined header (       set /p header=<%%a       echo !header!    )     more +1 %%a  )) > combined.csv

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