REM tail.bat
REM
REM Usage: tail.bat <file> <number-of-lines>
REM
REM Examples: tail.bat myfile.txt 10
REM tail.bat "C:\My File\With\Spaces.txt" 10
@ECHO OFF
for /f "tokens=2-3 delims=:" %%f in ('find /c /v "" %1') do (
for %%F in (%%f %%g) do set nbLines=%%F )
set /a nbSkippedLines=%nbLines%-%2
for /f "usebackq skip=%nbSkippedLines% delims=" %%d in (%1) do echo %%d
@echo off
SETLOCAL ENABLEEXTENSIONS ENABLEDELAYEDEXPANSION
rem tail.bat -d <lines> <file>
rem tail.bat -f <file>
rem ****** MAIN ******
IF "%1"=="-d" GOTO displayfile
IF "%1"=="-f" GOTO followfile
GOTO end
rem ************
rem Show Last n lines of file
rem ************
:displayfile
SET skiplines=%2
SET sourcefile=%3
rem *** Get the current line count of file ***
FOR /F "usebackq tokens=3,3 delims= " %%l IN (`find /c /v "" %sourcefile%`) DO (call SET find_lc=%%l)
rem *** Calculate the lines to skip
SET /A skiplines=%find_lc%-!skiplines!
rem *** Display to screen line needed
more +%skiplines% %sourcefile%
GOTO end
rem ************
rem Show Last n lines of file & follow output
rem ************
:followfile
SET skiplines=0
SET findend_lc=0
SET sourcefile=%2
:followloop
rem *** Get the current line count of file ***
FOR /F "usebackq tokens=3,3 delims= " %%l IN (`find /c /v "" %sourcefile%`) DO (call SET find_lc=%%l)
FOR /F "usebackq tokens=3,3 delims= " %%l IN (`find /c /v "" %sourcefile%`) DO (call SET findend_lc=%%l)
rem *** Calculate the lines to skip
SET /A skiplines=%findend_lc%-%find_lc%
SET /A skiplines=%find_lc%-%skiplines%
rem *** Display to screen line when file updated
more +%skiplines% %sourcefile%
goto followloop
:end
@echo off
:: This is a batch script I wrote to mimic the 'tail' UNIX command.
:: It is far from perfect, but I am posting it in the hopes that it will
:: be improved by other people. This was designed to work on Windows 7.
:: I have not tested it on any other versions of Windows
if "%1" == "" goto noarg
if "%1" == "/?" goto help
if "%1" == "-?" goto help
if NOT EXIST %1 goto notfound
set taildelay=%2
if "%taildelay%"=="" set taildelay=1
:loop
cls
type %1
:: I use the CHOICE command to create a delay in batch.
CHOICE /C YN /D Y /N /T %taildelay%
goto loop
:: Error handlers
:noarg
echo No arguments given. Try /? for help.
goto die
:notfound
echo The file '%1' could not be found.
goto die
:: Help text
:help
echo TAIL filename [seconds]
:: I use the call more pipe as a way to insert blank lines since echo. doesnt
:: seem to work on Windows 7
call | more
echo Description:
echo This is a Windows version of the UNIX 'tail' command.
echo Written completely from scratch by Andrey G.
call | more
echo Parameters:
echo filename The name of the file to display
call | more
echo [seconds] The number of seconds to delay before reloading the
echo file and displaying it again. Default is set to 1
call | more
echo ú /? Displays this help message
call | more
echo NOTE:
echo To exit while TAIL is running, press CTRL+C.
call | more
echo Example:
echo TAIL foo 5
call | more
echo Will display the contents of the file 'foo',
echo refreshing every 5 seconds.
call | more
:: This is the end
:die