Nullifying a log file

Clear a file using /dev/null 

/dev/null is often referred to a black hole in Linux based systems. It discards all the data written to it and sends EOF (End of File) character to any process reading data from it. With this logic, we can clear the contents of a file.

cp /dev/null logfile

cat /dev/null > logfile

> logfile

dd if=/dev/null of=logfile

Clear a file using truncate

truncate logfile --size 0