Clear log file and write to it with out restarting the server

[zivbrachia]

Hi, I want to manually clear the log file.
I want to use the same features of "maxLogSize" with "backups" and I need the ability of do it manually.
by using log4js command:

The log file will be backups it self
Change file name
Clear the main log file.
I need your help with solution for this problem, thanks