The stop command method for UNIX systems

On UNIX systems only, it is possible to request that a notifier “roll over” its log files. You do this by sending a SIGUSR1 signal to the process ID writing the log file. Use the stop command of your shell:

% kill -USR1 <pid>

Upon receipt of the USR1 signal, a notifier first writes an informational message to the end of the current log file, repeats the steps it executed at startup, and creates a new log file and a backup log file as previously described.