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@echo off & setlocal enableextensions
set "a2z=abcdefghijklmnopqrstuvwxyz" & set "nos=0123456789"

if "%~1"=="" (goto usage) else set "nth=%~1"
if "%~2"=="" (set "errmsg=specify a file name" & goto error
) else set "file=%~2"
if "%~3"=="" (set "var=nthline") else (
echo("%~3"| findstr /ix ^"\"[%a2z%][%a2z%_%nos%]*\"^" >nul ^
&& set "var=%~3" || (set errmsg=^""%~3" is invalid variable name^"
goto error))

for /f "tokens=1* delims=0123456789" %%a in ("A0%nth%") ^
do if "%%b" neq "" (
set errmsg=^""%nth%" is not a valid line number^"
goto error)
if %nth%==0 set /a nth=1

if exist "%file%\" (set errmsg=^""%file%" is a folder^"
goto error) else if not exist "%file%" (
set "errmsg=file "%file%" not found" & goto error)
echo("%file%" | findstr "\* \?" >nul ^
&& (set "errmsg=wildcards (* and ?) not permitted in filename"
goto error)

for /f "tokens=1" %%c in ('type "%file%" ^| find /c /v ""') ^
do set /a lines=%%c
if %lines%==0 (set errmsg=^""%file%" is an empty file^"
goto error)
if %nth% gtr %lines% (
set "errmsg=specify a line number between 1 and %lines%"
goto error)

goto loop
:usage
(echo(Stores the nth line of a text file in a variable. & echo(
echo(Usage: & echo(
echo(  %~n0 N FileName [Var] & echo(
echo(where the contents of line number N of file FileName ^
will be stored in variable& echo(Var.  The variable name ^
NthLine is used by default if none is specified.) 1>&2
:error
if defined errmsg ^
for /f "delims=" %%e in ("%errmsg%") do echo(%%~e 1>&2
endlocal & exit /b 1

:loop
set /a nth-=1
if %nth% gtr 0 set "opts=skip=%nth% "
for /f "%opts%delims=" %%a in ('findstr /n "^" "%file%"') do (
set "line=%%a"
setlocal enabledelayedexpansion
set "line="!line:*:=!""
for /f "delims=" %%b in ("!line!") do (
endlocal & endlocal & set "%var%=%%~b")
if defined %var% (set %var% & exit /b 0
) else (echo(line %~1 of file "%~2" is blank: ^
variable "%var%" not defined 1>&2 & exit /b 1)
)

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@echo off
set /a num=%2-1
more +%num% <"%~1" >file.tmp
set /p "var="<file.tmp >nul
echo %var%
del file.tmp
pause

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more +99 bigfile.txt | findstr /n $ | findstr /b "1:" ^
| (pause>nul&pause>nul&findstr $ >line100.txt)

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getnthline getnthline.cmd 2