保留文本文件中的最後100行數據

Question

我在.bat文件中擁有此腳本，並且只想在文件末尾保留最近的100行。

如何刪除所有其他行？

@echo off 
REM *DATETIME2.BAT 
REM *Copy date and time to create a new log file 
echo.|date>>"\\spserver\myfolder\dt.tmp" 
echo.|time>>"\\spserver\myfolder\dt.tmp" 
IF NOT EXIST "\\spserver\myfolder\dt.tmp" GOTO Error1 
type "\\spserver\myfolder\dt.tmp"|FIND "current">"\\spserver\myfolder\dt.log" 
rem del "\\spserver\myfolder\dt.tmp" 
GOTO End 

:Error1 
Echo. 
Echo There was an error processing the command. 
Echo Unable to find temporary sort file DATETIME2.TMP. 
Echo. 
GOTO End 

:End 

Answer 1

在這裏你去：

Call :Tail 100 dt.log tempout.txt 
move /y tempout.txt dt.log>nul 
exit /b 

:Tail <numlines> <FileIn> <FileOut> 
FOR /F "usebackq tokens=3,3 delims= " %%l IN (
    `find /c /v "" %2`) DO (call SET find_lc=%%l) 
SET /a linenumber=%find_lc%-%1 
IF %linenumber% LSS 1 (
    more +0 %2 >> %3 
) ELSE (
    more +%linenumber% %2 >> %3 
)