:: 保留文本中的前 N 行（覆盖原文件）

@echo off
:: -------- 设置 --------
set File="X.TXT"
set N=300
:: -------- /设置 --------

if not exist %File% exit
if not defined N exit

findstr /n .* %File% > "%temp%\tmp"

(
    for /f "usebackq delims=" %%a in ("%temp%\tmp") do (
        set Var=%%a
        set /a Line = Var
        SetLocal EnableDelayedExpansion
        if !Line! leq !N! echo,!Var:*:=!
        EndLocal
    )
) > %File%

del "%temp%\tmp"
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head -n 300 1.txt >2.txt
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sed "1,300!d" 1.txt >2.txt
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gawk "NR>=1&&NR<=300" 1.txt >2.txt
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type test.txt |findstr /n .*|findstr "^[0-9] ^[0-9][0-9]: ^[0-2][0-9][0-9]: ^300:"
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