Expected identifier in windows script host

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batch

This code is for login and logout session. whenever i run the following code,i get error as expected identifier.But when i resolve that error then another error occurs as expected 'IN'. As i am new to this scripting language its difficult for me so solve such errors. Please help me.Code is below:

REM Login Script:
for /f "Tokens=2 Delims=[]" %%i in ('ping -n 1 "%computername%"') do set IP=%%i

echo %username% logged ON %computername%, IP=%IP% @ %time% %date% >> F:\$\%username%.txt


REM Logoff Script:
echo %username% logged OFF %computername% @ %time% %date% >> F:\$\%username%.txt 


REM Startup Script:
for /f "Tokens=2 Delims=[]" %%i in ('ping -n 1 "%computername%"') do set IP=%%i
echo Started up, IP=%IP% @ %time% %date% >> F:\$\%computername%.txt

REM Shutdown Script:
echo Shutdown @ %time% %date% >> F:\$\%computername%.txt